BritBox is supported on most Roku devices, though some older models may no longer be compatible.
To get started, follow these steps from Roku to download the BritBox app. If you run into issues, make sure your Roku software is up to date. Once the app is installed, open BritBox and sign in using your existing account—whether you're a current or returning subscriber.
Note: Roku no longer supports legacy models 3600 and 4400X or any older Roku devices. Streaming the BritBox app on these older devices may not be possible.