Install the long-term support (LTS) version of Node.js, which includes NPM.
Clone the repo: git clone https://github.com/nhsuk/nhsuk-service-manual.git nhsuk-service-manual
and whilst in the project directory cd nhsuk-service-manual
, install the required npm packages with: npm install
Run the project in development mode npm run watch
and visit http://localhost:3000.