diff --git a/app/jobs/gias/sync_all_schools_job.rb b/app/jobs/gias/sync_all_schools_job.rb
index 915f34b69..17453ee7e 100644
--- a/app/jobs/gias/sync_all_schools_job.rb
+++ b/app/jobs/gias/sync_all_schools_job.rb
@@ -3,14 +3,19 @@ class SyncAllSchoolsJob < ApplicationJob
     queue_as :default
 
     def perform
-      tempfile = Gias::CsvDownloader.call
-      Rails.logger.info "GIAS CSV Downloaded!"
+      Rails.logger.info "Downloading GIAS CSV file..."
+      gias_csv = Gias::CsvDownloader.call
+
+      Rails.logger.info "Transforming GIAS CSV file..."
+      transformed_csv = Gias::CsvTransformer.call(gias_csv)
 
       Rails.logger.info "Importing GIAS data"
-      Gias::CsvImporter.call(tempfile.path)
+      Gias::CsvImporter.call(transformed_csv.path)
       Geocoder::UpdateAllSchoolsJob.perform_later
 
-      tempfile.unlink
+      gias_csv.unlink
+      transformed_csv.unlink
+      Rails.logger.info "Done"
     end
   end
 end
diff --git a/app/services/gias/csv_importer.rb b/app/services/gias/csv_importer.rb
index 7811528d0..76d37c5f1 100644
--- a/app/services/gias/csv_importer.rb
+++ b/app/services/gias/csv_importer.rb
@@ -5,9 +5,7 @@ class CsvImporter
     include ServicePattern
     include RegionalAreas
 
-    OPEN_SCHOOL = "1".freeze
     SUPPORTED_BY_A_TRUST = "1".freeze
-    NON_ENGLISH_ESTABLISHMENTS = %w[8 10 25 24 26 27 29 30 32 37 49 56 57].freeze
 
     attr_reader :csv_path
 
@@ -16,17 +14,11 @@ def initialize(csv_path)
     end
 
     def call
-      invalid_records = []
       school_records = []
       trust_records = []
       trust_associations = Hash.new { |h, k| h[k] = [] }
 
-      CSV
-        .foreach(csv_path, headers: true)
-        .with_index(2) do |school, row_number|
-        invalid_records << "Row #{row_number} is invalid" if invalid?(school)
-        next if school_excluded?(school) || invalid?(school)
-
+      CSV.foreach(csv_path, headers: true) do |school|
         school_records << {
           urn: school["URN"],
           name: school["EstablishmentName"],
@@ -72,10 +64,6 @@ def call
         end
       end
 
-      if invalid_records.any?
-        Rails.logger.info "Invalid rows - #{invalid_records.inspect}"
-      end
-
       Rails.logger.silence do
         School.upsert_all(school_records, unique_by: :urn)
         Trust.upsert_all(trust_records.uniq, unique_by: :uid)
@@ -117,14 +105,5 @@ def associate_schools_to_trusts(trust_data)
         School.where(urn: urns).update_all(trust_id: trust.id)
       end
     end
-
-    def invalid?(school)
-      school["URN"].blank? || school["EstablishmentName"].blank?
-    end
-
-    def school_excluded?(school)
-      school["EstablishmentStatus (code)"] != OPEN_SCHOOL ||
-        NON_ENGLISH_ESTABLISHMENTS.include?(school["TypeOfEstablishment (code)"])
-    end
   end
 end
diff --git a/app/services/gias/csv_transformer.rb b/app/services/gias/csv_transformer.rb
new file mode 100644
index 000000000..8058c5504
--- /dev/null
+++ b/app/services/gias/csv_transformer.rb
@@ -0,0 +1,55 @@
+module Gias
+  class CsvTransformer
+    include ServicePattern
+
+    def initialize(input_file)
+      @input_file = input_file
+      @output_file = Tempfile.new
+    end
+
+    def call
+      output_csv = CSV.new(output_file)
+
+      CSV.new(input_file, headers: true, return_headers: true).each do |row|
+        if row.header_row? || school_in_scope?(row)
+          output_csv << row
+        end
+      end
+
+      # Rewind the file so it's ready for reading
+      output_file.rewind
+      output_file
+    end
+
+    private
+
+    attr_reader :input_file, :output_file
+
+    # The 'School Placements' and 'Funding Mentors' services only need to know
+    # about schools in England. Closed schools and those outside of England can
+    # be filtered out from the CSV.
+    def school_in_scope?(row)
+      school = School.new(row)
+      school.open? && school.in_england?
+    end
+
+    class School
+      OPEN_SCHOOL = "1".freeze
+      NON_ENGLISH_ESTABLISHMENTS = %w[8 10 25 24 26 27 29 30 32 37 49 56 57].freeze
+
+      attr_reader :row
+
+      def initialize(row)
+        @row = row
+      end
+
+      def open?
+        row.fetch("EstablishmentStatus (code)") == OPEN_SCHOOL
+      end
+
+      def in_england?
+        !NON_ENGLISH_ESTABLISHMENTS.include? row.fetch("TypeOfEstablishment (code)")
+      end
+    end
+  end
+end
diff --git a/spec/fixtures/gias/gias_subset_transformed.csv b/spec/fixtures/gias/gias_subset_transformed.csv
new file mode 100644
index 000000000..9264ee670
--- /dev/null
+++ b/spec/fixtures/gias/gias_subset_transformed.csv
@@ -0,0 +1,4 @@
+URN,LA (code),LA (name),EstablishmentNumber,EstablishmentName,TypeOfEstablishment (code),TypeOfEstablishment (name),EstablishmentTypeGroup (code),EstablishmentTypeGroup (name),EstablishmentStatus (code),EstablishmentStatus (name),ReasonEstablishmentOpened (code),ReasonEstablishmentOpened (name),OpenDate,ReasonEstablishmentClosed (code),ReasonEstablishmentClosed (name),CloseDate,PhaseOfEducation (code),PhaseOfEducation (name),StatutoryLowAge,StatutoryHighAge,Boarders (code),Boarders (name),NurseryProvision (name),OfficialSixthForm (code),OfficialSixthForm (name),Gender (code),Gender (name),ReligiousCharacter (code),ReligiousCharacter (name),ReligiousEthos (name),Diocese (code),Diocese (name),AdmissionsPolicy (code),AdmissionsPolicy (name),SchoolCapacity,SpecialClasses (code),SpecialClasses (name),CensusDate,NumberOfPupils,NumberOfBoys,NumberOfGirls,PercentageFSM,TrustSchoolFlag (code),TrustSchoolFlag (name),Trusts (code),Trusts (name),SchoolSponsorFlag (name),SchoolSponsors (name),FederationFlag (name),Federations (code),Federations (name),UKPRN,FEHEIdentifier,FurtherEducationType (name),OfstedLastInsp,OfstedSpecialMeasures (code),OfstedSpecialMeasures (name),LastChangedDate,Street,Locality,Address3,Town,County (name),Postcode,SchoolWebsite,TelephoneNum,HeadTitle (name),HeadFirstName,HeadLastName,HeadPreferredJobTitle,BSOInspectorateName (name),InspectorateReport,DateOfLastInspectionVisit,NextInspectionVisit,TeenMoth (name),TeenMothPlaces,CCF (name),SENPRU (name),EBD (name),PlacesPRU,FTProv (name),EdByOther (name),Section41Approved (name),SEN1 (name),SEN2 (name),SEN3 (name),SEN4 (name),SEN5 (name),SEN6 (name),SEN7 (name),SEN8 (name),SEN9 (name),SEN10 (name),SEN11 (name),SEN12 (name),SEN13 (name),TypeOfResourcedProvision (name),ResourcedProvisionOnRoll,ResourcedProvisionCapacity,SenUnitOnRoll,SenUnitCapacity,GOR (code),GOR (name),DistrictAdministrative (code),DistrictAdministrative (name),AdministrativeWard (code),AdministrativeWard (name),ParliamentaryConstituency (code),ParliamentaryConstituency (name),UrbanRural (code),UrbanRural (name),GSSLACode (name),Easting,Northing,MSOA (name),LSOA (name),InspectorateName (name),SENStat,SENNoStat,BoardingEstablishment (name),PropsName,PreviousLA (code),PreviousLA (name),PreviousEstablishmentNumber,OfstedRating (name),RSCRegion (name),Country (name),UPRN,SiteName,QABName (code),QABName (name),EstablishmentAccredited (code),EstablishmentAccredited (name),QABReport,CHNumber,MSOA (code),LSOA (code),FSM,AccreditationExpiryDate
+100000,201,City of London,3614,The Aldgate School,2,Voluntary aided school,4,Local authority maintained schools,1,Open,0,Not applicable,,0,Not applicable,,2,Primary,3,11,1,No boarders,Has Nursery Classes,2,Does not have a sixth form,3,Mixed,2,Church of England,Does not apply,CE23,Diocese of London,0,Not applicable,271,2,No Special Classes,19-01-2023,271,144,127,18.10,0,Not applicable,,,Not applicable,,Not under a federation,,,10079319,,Not applicable,19-04-2013,0,Not applicable,09-02-2024,St James's Passage,Duke's Place,,London,,EC3A 5DE,www.thealdgateschool.org,2072831147,Miss,Alexandra,Allan,Headteacher,Not applicable,,,,Not applicable,,Not applicable,Not applicable,Not applicable,,,Not applicable,Not applicable,,,,,,,,,,,,,,,,,,,H,London,E09000001,City of London,E05009308,Portsoken,E14000639,Cities of London and Westminster,A1,(England/Wales) Urban major conurbation,E09000001,533498,181201,City of London 001,City of London 001F,,,,,,999,,,Outstanding,North-West London and South-Central England,,200000071925,,0,Not applicable,0,Not applicable,,,E02000001,E01032739,49,
+137666,878,Devon,3106,Chudleigh Knighton Church of England Primary School,34,Academy converter,10,Academies,1,Open,10,Academy Converter,01-11-2011,99,,,2,Primary,5,11,1,No boarders,No Nursery Classes,0,Not applicable,3,Mixed,2,Church of England,Does not apply,CE15,Diocese of Exeter,0,Not applicable,105,2,No Special Classes,19-01-2023,100,51,49,19.00,3,Supported by a multi-academy trust,3104,THE FIRST FEDERATION TRUST,Linked to a sponsor,The First Federation Trust,Not applicable,,,10035224,,Not applicable,09-02-2023,0,Not applicable,13-09-2023,Chudleigh Knighton,,,Newton Abbot,Devon,TQ13 0EU,http://www.chudleigh-knighton.devon.sch.uk,1626852314,Mr,Simon,Westwood,Head of Teaching & Learning,Not applicable,,,,Not applicable,,Not applicable,Not applicable,Not applicable,,,Not applicable,Not applicable,,,,,,,,,,,,,,,,,,,K,South West,E07000045,Teignbridge,E05011899,Chudleigh,E14000623,Central Devon,D1,(England/Wales) Rural town and fringe,E10000008,284509,77456,Teignbridge 004,Teignbridge 004F,,,,,,911,Pre LGR (1998) Devon,3106,Good,South-West England,,10032960701,,0,Not applicable,0,Not applicable,,,E02004204,E01020223,19,
+124087,860,Staffordshire,2216,Thomas Barnes Primary School,5,Foundation school,4,Local authority maintained schools,1,Open,0,Not applicable,,0,Not applicable,,2,Primary,4,11,1,No boarders,No Nursery Classes,2,Does not have a sixth form,3,Mixed,0,Does not apply,Does not apply,0,Not applicable,0,Not applicable,105,2,No Special Classes,19-01-2023,106,53,53,9.40,1,Supported by a trust,1579,Tame Valley Co-Operative Learning Trust,Not applicable,,Not under a federation,,,10073083,,Not applicable,28-03-2014,0,Not applicable,19-01-2024,School Lane,Hopwas,,Tamworth,Staffordshire,B78 3AD,http://www.thomasbarnes.staffs.sch.uk,1827213840,Mrs,E,Tibbitts,Headteacher,Not applicable,,,,Not applicable,,Not applicable,Not applicable,Not applicable,,,Not applicable,Not applicable,,,,,,,,,,,,,,,,,,,F,West Midlands,E07000194,Lichfield,E05010672,Whittington & Streethay,E14000986,Tamworth,F1,(England/Wales) Rural hamlet and isolated dwellings,E10000028,417927,305209,Lichfield 008,Lichfield 008B,,,,,,934,Pre LGR (1997) Staffordshire,,Outstanding,West Midlands,,100031712411,,0,Not applicable,0,Not applicable,,,E02006153,E01029517,10,
diff --git a/spec/fixtures/gias/import_with_all_valid_schools.csv b/spec/fixtures/gias/import_with_all_valid_schools.csv
deleted file mode 100644
index 7a8448f8a..000000000
--- a/spec/fixtures/gias/import_with_all_valid_schools.csv
+++ /dev/null
@@ -1,5 +0,0 @@
-URN,EstablishmentName,Town,Postcode,EstablishmentStatus (code),TypeOfEstablishment (code),DistrictAdministrative (code)
-130,InnerLondonSchool,InnerLondonTown,Postcode,1,7,E09000007
-131,OuterLondonSchool,OuterLondonTown,Postcode,1,7,E09000004
-123,FringeSchool,FringeTown,Postcode,1,7,E06000039
-132,RestOfEnglandSchool,RestOfEnglandTown,Postcode,1,7,E09000099
diff --git a/spec/fixtures/gias/import_with_invalid_schools.csv b/spec/fixtures/gias/import_with_trusts_and_regions.csv
similarity index 81%
rename from spec/fixtures/gias/import_with_invalid_schools.csv
rename to spec/fixtures/gias/import_with_trusts_and_regions.csv
index 8d93ba7f3..ff0f3deb2 100644
--- a/spec/fixtures/gias/import_with_invalid_schools.csv
+++ b/spec/fixtures/gias/import_with_trusts_and_regions.csv
@@ -3,7 +3,4 @@ URN,EstablishmentName,Town,Postcode,EstablishmentStatus (code),TypeOfEstablishme
 131,OuterLondonSchool,OuterLondonTown,Postcode,1,7,E09000004,,
 123,FringeSchool,FringeTown,Postcode,1,7,E06000039,,
 132,RestOfEnglandSchool,RestOfEnglandTown,Postcode,1,7,E09000099,,
-124,School,Town,Postcode,2,7,E06000031,,
-124,School,Town,Postcode,1,8,E06000031,,
-124,,Town,Postcode,1,7,E06000031,,
 140,TrustSchool,TrustTown,Postcode,1,7,E09000007,1,12345,Department for Education Trust
diff --git a/spec/jobs/gias/sync_all_schools_job_spec.rb b/spec/jobs/gias/sync_all_schools_job_spec.rb
index 7a45f24f2..8d5a0acc6 100644
--- a/spec/jobs/gias/sync_all_schools_job_spec.rb
+++ b/spec/jobs/gias/sync_all_schools_job_spec.rb
@@ -1,21 +1,18 @@
 require "rails_helper"
 
 RSpec.describe Gias::SyncAllSchoolsJob, type: :job do
-  describe "#perform" do
-    it "calls Gias::CsvDownloader and Gias::CsvImporter service" do
-      # Testing Gias::CsvDownloader
-      today = Time.zone.today.strftime("%Y%m%d")
-      gias_filename = "edubasealldata#{today}.csv"
-      tempfile = Tempfile.new("foo")
+  it "calls Gias::CsvDownloader, then Gias::CsvTransformer, then Gias::CsvImporter" do
+    downloaded_csv = instance_double(Tempfile)
+    transformed_csv = instance_double(Tempfile, path: "/fake/path/to/stubbed/file.csv")
 
-      allow(Down).to receive(:download).with(
-        "#{ENV["GIAS_CSV_BASE_URL"]}/#{gias_filename}",
-      ).and_return(tempfile)
+    allow(Gias::CsvDownloader).to receive(:call).and_return(downloaded_csv)
+    allow(Gias::CsvTransformer).to receive(:call).with(downloaded_csv).and_return(transformed_csv)
 
-      # Testing Gias::CsvImporter
-      expect(Gias::CsvImporter).to receive(:call).with(tempfile.path)
-      described_class.perform_now
-    end
+    expect(Gias::CsvImporter).to receive(:call).with(transformed_csv.path).ordered
+    expect(downloaded_csv).to receive(:unlink).ordered
+    expect(transformed_csv).to receive(:unlink).ordered
+
+    described_class.perform_now
   end
 
   describe "integration test" do
diff --git a/spec/services/gias/csv_importer_spec.rb b/spec/services/gias/csv_importer_spec.rb
index 57765fd71..212818a16 100644
--- a/spec/services/gias/csv_importer_spec.rb
+++ b/spec/services/gias/csv_importer_spec.rb
@@ -1,108 +1,82 @@
 require "rails_helper"
 
 RSpec.describe Gias::CsvImporter do
-  subject(:gias_importer) { described_class.call(file_path) }
+  subject(:gias_importer) { described_class.call(csv_path) }
+
+  let(:csv_path) { "spec/fixtures/gias/import_with_trusts_and_regions.csv" }
 
   it_behaves_like "a service object" do
-    let(:params) { { csv_path: "a_path" } }
+    let(:params) { { csv_path: } }
   end
 
-  context "with an invalid row in the csv" do
-    # CSV contains 4 valid schools and 3 invalid schools
-    let(:file_path) { "spec/fixtures/gias/import_with_invalid_schools.csv" }
+  it "creates new schools" do
+    expect { gias_importer }.to change(School, :count).from(0).to(5)
+  end
 
-    it "inserts the correct schools" do
-      expect { gias_importer }.to change(School, :count).from(0).to(5)
-    end
+  it "updates existing schools" do
+    school = create(:school, urn: "123", name: "The wrong name")
+    expect { gias_importer }.to change { school.reload.name }.to "FringeSchool"
+  end
 
-    it "updates the correct schools" do
-      school = create(:school, urn: "123")
-      expect { gias_importer }.to change { school.reload.name }.to "FringeSchool"
-    end
+  it "logs messages to STDOUT" do
+    expect(Rails.logger).to receive(:info).with("GIAS Data Imported!")
 
-    it "logs messages to STDOUT" do
-      expect(Rails.logger).to receive(:info).with("Invalid rows - [\"Row 8 is invalid\"]")
-      expect(Rails.logger).to receive(:info).with("GIAS Data Imported!")
+    gias_importer
+  end
 
-      gias_importer
-    end
+  it "associates schools to regions" do
+    gias_importer
+    inner_london_school = School.find_by(urn: "130")
+    outer_london_school = School.find_by(urn: "131")
+    fringe_school = School.find_by(urn: "123")
+    rest_of_england_school = School.find_by(urn: "132")
+
+    expect(inner_london_school.region.name).to eq("Inner London")
+    expect(outer_london_school.region.name).to eq("Outer London")
+    expect(fringe_school.region.name).to eq("Fringe")
+    expect(rest_of_england_school.region.name).to eq("Rest of England")
+  end
 
-    describe "regions" do
-      context "when associating regions" do
-        it "associates schools to regions" do
-          gias_importer
-          inner_london_school = School.find_by(urn: "130")
-          outer_london_school = School.find_by(urn: "131")
-          fringe_school = School.find_by(urn: "123")
-          rest_of_england_school = School.find_by(urn: "132")
-
-          expect(inner_london_school.region.name).to eq("Inner London")
-          expect(outer_london_school.region.name).to eq("Outer London")
-          expect(fringe_school.region.name).to eq("Fringe")
-          expect(rest_of_england_school.region.name).to eq("Rest of England")
-        end
+  describe "associating schools with trusts" do
+    context "when the trust does not exist" do
+      it "creates the trust" do
+        expect { gias_importer }.to change(Trust, :count).from(0).to(1)
       end
-    end
 
-    describe "trusts" do
-      context "when associating trusts" do
-        context "and the trust does not exist" do
-          it "creates the trust" do
-            expect { gias_importer }.to change(Trust, :count).from(0).to(1)
-          end
-
-          it "associates schools to the trust" do
-            gias_importer
-            trust = Trust.find_by(uid: "12345")
-            school = School.find_by(urn: "140")
-
-            expect(school.trust).to eq(trust)
-          end
-        end
-
-        context "and the trust already exists" do
-          before do
-            create(:trust, uid: "12345")
-          end
-
-          it "does not create a new trust" do
-            expect { gias_importer }.not_to change(Trust, :count)
-          end
-
-          it "associates schools to the trust" do
-            gias_importer
-            trust = Trust.find_by(uid: "12345")
-            school = School.find_by(urn: "140")
-
-            expect(school.trust).to eq(trust)
-          end
-        end
-
-        context "and the school is not associated with a trust" do
-          it "does not associate the school to a trust" do
-            gias_importer
-            school = School.find_by(urn: "132")
-
-            expect(school.trust).to be_nil
-          end
-        end
+      it "associates schools to the trust" do
+        gias_importer
+        trust = Trust.find_by(uid: "12345")
+        school = School.find_by(urn: "140")
+
+        expect(school.trust).to eq(trust)
       end
     end
-  end
 
-  context "with all valid rows in the csv" do
-    # CSV contains 4 valid schools
-    let(:file_path) { "spec/fixtures/gias/import_with_all_valid_schools.csv" }
+    context "when the trust already exists" do
+      before do
+        create(:trust, uid: "12345")
+      end
+
+      it "does not create a new trust" do
+        expect { gias_importer }.not_to change(Trust, :count)
+      end
+
+      it "associates schools to the trust" do
+        gias_importer
+        trust = Trust.find_by(uid: "12345")
+        school = School.find_by(urn: "140")
 
-    it "inserts the correct schools" do
-      expect { gias_importer }.to change(School, :count).from(0).to(4)
+        expect(school.trust).to eq(trust)
+      end
     end
 
-    it "logs messages to STDOUT" do
-      expect(Rails.logger).not_to receive(:info).with("Invalid rows - [\"Row 8 is invalid\"]")
-      expect(Rails.logger).to receive(:info).with("GIAS Data Imported!")
+    context "when the school is not associated with a trust" do
+      it "does not associate the school to a trust" do
+        gias_importer
+        school = School.find_by(urn: "132")
 
-      gias_importer
+        expect(school.trust).to be_nil
+      end
     end
   end
 end
diff --git a/spec/services/gias/csv_transformer_spec.rb b/spec/services/gias/csv_transformer_spec.rb
new file mode 100644
index 000000000..ac84c1b2f
--- /dev/null
+++ b/spec/services/gias/csv_transformer_spec.rb
@@ -0,0 +1,24 @@
+require "rails_helper"
+
+RSpec.describe Gias::CsvTransformer do
+  subject(:output_file) { described_class.call(input_file) }
+
+  let(:input_file_path) { "spec/fixtures/gias/gias_subset.csv" }
+  let(:input_file) { File.open(input_file_path, "r") }
+
+  it_behaves_like "a service object" do
+    let(:params) { { 0 => input_file } }
+  end
+
+  it "transforms the GIAS CSV" do
+    expected_output = File.read("spec/fixtures/gias/gias_subset_transformed.csv")
+    actual_output = output_file.read
+    expect(actual_output).to eq(expected_output)
+  end
+
+  it "filters out schools which are Closed or not in England" do
+    output_csv = CSV.read(output_file, headers: true)
+    urns = output_csv.values_at("URN").flatten
+    expect(urns).to eq %w[100000 137666 124087]
+  end
+end