Thanks for the replies here guys, Viaplay have confirmed to me via email that it is still available and their own website here also confirms it is
https://www.viaplaygroup.com/news/news-releases/viaplay-launches-roku-devices-us-canada-and-uk
is there anyone actually at Roku who can confirm anything? I’m not the only one who can’t find this app in the UK as demonstrated in other links to posts