The BritBox app is available for most Fire TV, including the Fire TV Stick (including 4K Select), the Fire TV Cube, and 'Fire Edition' TVs.
Remember to update your Fire TV operating system to the latest version! Here are instructions from Amazon.
Our app isn't available for Kindle or Fire Tablets. If this is you, you may be able to watch it via Amazon Prime Video Channels by adding on a BritBox subscription. Find out more.