I think it was part of Datel. Definitely unlicensed, anyway. seems to have been a few different developers working on these things, it wouldn't surprise me if they were actually homebrew devs that Datel paid to make games for them.
also talking of UK based unlicensed GB publishers, I think I read somewhere that Midas Interactive was once working on a line of unlicensed GBC games, but I don't think anything ever came of that..