I was just googling the Greek and Cypriot entries to see just how much joint work they do (answer: loads) but what also came up was how much straightforward schmoozing, personal appearances, fun concerts (etc) and sheer graft the Greek one in particular had done in the few months beforehand.
I don't know if our guy did. And we do know it matters.
Interestingly (ish) I also think we're very unreceptive to other country's acts doing their stuff over here. We really do, as a nation, go into each Eurovision week as a kind of last minute exercise in finding out, whereas that isn't the case elsewhere. Maybe we come off as not really performing as part of it as a result.(*)
The exception, obviously, being Sam Ryder.
(* actually I think it is almost always a lack of effective 'touring' and a terrible staging)