We don’t need Roy and Kirsty to have a liaison. The writers need to pave the way for Roy to leave Ambridge. He’s the last link to the Tucker family (bar Phoebe). I thought the Tuckers, Carters and Grundies would be around forever – but I was wrong about the Tuckers.
I can’t see any purpose in keeping Roy around except as a friend to Tom. His daughter, Phoebe, doesn’t really need him. She chose not to live with him and now she’s gone off to University. I can’t see her settling in Ambridge after Oxford. As for Tom, he doesn’t need friends to keep him in Ambridge: he has a family that isn’t going anywhere. It’s not enough for Roy to be kept in the background, working away at Grey Gables and feeling sorry for himself because he’s single.
Roy should have gone after he disgraced himself with The Widow Pargetter.