Bugger! I thought that the only benefit of Brexit was that we would be banned from the Eurovision song contest.
The EBU has nothing to do with political boundaries. It's an as-the-microwave-flies kind of thing between broadcasters.
(I'm not a fan of the Eurovison song contest either. It's what QUILTBAGs have instead of sportsball, and I find the whole thing quite tedious. Apart from that year that $scandiwegian_country entered a bunch of death-metal Klingons, that was amusing.)