I've eaten at #3 (The Fat Duck) - More of an 'experience' than a meal, thanks to wacky Chef Heston Blumenthal (E.g. with the Seafood course we were given an ipod to listen to the sea with waves crashing and gulls crying. The Snail Porridge was nice though). I think with wine it was about £120 per head.
I've eaten at a few of the others in the top 50 and thoroughly enjoyed them all in different ways. If you want a hearty meal at a decent price, it really isn't worth bothering with them. You pay the premium for amazingly innovative use of expensive ingredients, presented in highly artistic ways, in very plush surroundings.
TBQH it's not something I like to do too often - most of those listed have 2 or 3 Michelin stars which attract a premium on the menu - average is about £80 - £120 per head + wine. We have a few 1 and 2 Michelin starred places nearby (my favourite being
Purnells. Unless you're ordering very expensive wine there's change out of £100 per person and the food, service and setting are outstanding value.