Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
We appreciate your patience regarding this matter. I understand that you are unable to access Britbox.
We recommend starting here to troubleshoot channel issues: Follow these steps in order:
1.Navigate to the channel tile on the Roku home screen, press the * key on your remote, and choose 'Remove channel'.
2.Next, restart your device from Settings>System>System restart. (For Roku TV Settings>System>Power>System restart)
3.Once your player/TV starts up again, go to 'Streaming Channels' on the Home screen, and add the channel back once more.
You may also refer to this link: How do I resolve channel playback issues? | Official Roku ...
If that still doesn't clear up the issue you're experiencing, we recommend contacting the channel provider directly to follow up for more help. They’ll be able to best assist with any issues that are occurring within their channel.