I'll put my lone vote in for Dark Sphere, mostly because everything else is unpleasantly impractical travel-wise.
The last couple of times I got up at 04:30 to get to Notts in time, I was in no state to game, really.
WHW is probably a better venue for table space, elbow room and terrain availability though, not to mention an interested audience.
As for the not-too-obvious non-GW bits, I can't imagine they've got .that. much more draconian in the last couple of years.
I'm pretty sure we had a couple of Gav's Liwets, among other things, studied in detail by a staffer, and only positive things said.