I'm gonna go against the grain here a bit... I live in the US, but I'm not seeing as big of an issue with holding a PPV over in the United Kingdom.
They are 5 hours behind Eastern Standard Time, so if they start at 9PM UK time, that's 4 PM EST. Most of the WrestleManias and Royal Rumbles in the 1990's started at 4PM EST. Especially if they are doing the event on a Sunday, chances are, you're not gonna cut a bunch of people out that have to work or whatnot, just because of an earlier start time. On top of that, they run a replay of the event immediately after the live show, so, even if you did have to miss the live show for work, etc, you'd stil get to see the replay at 7PM EST. The key is, would people in the United Kingdom be willing (or allowed, as I think there are some curfew laws in the UK) to stay until midnight to see a PPV there?
Realistically, I don't see it happening, but I don't see it to be as much of an impossibility as others seem to think it is. I don't think the UK would get a WrestleMania, simply because it's 4 hours and even a three hour show starting at 4 EST isn't ending until Midnight UK time. I also see a bit of difficulty in doing a Rumble or Survivor Series there, especially outdoors in January or November, so the only one left would be Summerslam.
One thought, with the above, would be, since it would be a Summerslam, why not do it on a Sunday, with a start time of midnight UK time? That would be 7 PM EST on Saturday and the people attending live would at least have the rest of Sunday to recoup, before having to go back to work on their Monday morning.
Recently, at the start of college basketball season in the US, they do a 24 hour marathon of games, with some games starting at 3 AM EST... I know, basketball and wrestling are different, but I think that would be sort of cool to have an event start at midnight local time and the US fans would still see the show at 7PM EST.
Again, I don't see it happening, but it could be done.
-Bill