Hi @Fraydnerv,
Thanks for reaching out to the Roku Community.
We can see that the TV Show is not available to stream on The Roku Channel: Britbox but only on the standalone Britbox channel.
Secondly, allow us to help you get access to the standalone Britbox channel. Did you restart your Roku device before re-installing the channel? That step is crucial when performing troubleshooting to ensure a clean channel install.
If you haven't tried the suggested order (remove > restart > re-install), we would recommend giving it a shot once again. We also suggest doing the restart from the Settings menu by navigating to Settings > System > Power (If you do not see a Power submenu, skip to the next step.) > System restart.
Keep us posted on how it goes.
Regards,
Nimfa