Offline Usage
Using this tool offline
This tool can be used without an internet connection. To enable offline access:
Visit the site while connected to the internet — navigate the site as normal. Visit all the pages you want to use when not connected to the internet on your device.
You will see a banner at the bottom of the screen that allows you to save the site to your device

Clicking 'Save for offline use' will save the site to your device - a green banner will appear to denote a successful save
You can now visit the site as normal whilst you are not connected to the internet
Keeping content up to date
If the site content has been updated and you visit the site, the banner will appear again, simply visit the site once while connected to the internet. Just click the 'Save for offline use' button and the updated site will be re-saved onto your device.