Virgin Media Player Channel has disappeared from my Roku. Cannot find any explanation or reason for this
I don't know if that is a UK-specific channel, but I see nothing in the store either. If it was an official channel supported by Virgin, then the only reason it would be removed is that Virgin decided to pull it. I would contact them and ask about it.
If it was not officially supported by Virgin, then Roku might have been requested to remove it due to copyright infringement. Roku has no choice but to comply with such requests when requested by the copyright holder.