Hi JayAy, thank you for getting in touch to bring this to our attention. Sorry to hear of your issues with the Britbox app on your V6 Box. Does this video unavailable message appear for all programmes on the Britbox app when trying to play them via your V6?
Do you ever get any error codes or is it just this message?
Are you having issues with any other apps, recordings or live TV?
All the best.
Molly