I think the UK could win if they send Adele, Robbie Williams or resurrect the Spice Girls. They have a pull all over Europe and the world.
Otherwise I don't think so. If you are from Eastern Europe or Scandinavia or from the Mediterranean countries you get to like a certain kind of music, which is played in your country, and the ones around you. That's what you vote for. I don't think the voting is that political, it's just that the UK is geographically fairly isolated, so the music selected for competition here is not spread out that much into other european countries.
There is the music that pulls all over the world, but if you are one of them, would you bother with Eurovision? Who is the last 'star' from any country participating?
You'd think so but as the votes aren't cast by the public I still think there will be block voting irrespective of who we rolled out including the big names. Add in no-one would bother unless they were on skid row and want a last punt at fame and it won't happen abd we're destined to be in the bottom third every time