We haven't used Aspire but have used No 1 in the past and can't recommend them enough!
When we went a couple of years ago it was £40 for the two of us, it seems to have gone up to £50 now, but we took into account we drink copious amounts of tea and a meal would probably cost about £10 each, so it was probably cheaper for us to use the lounge! Lol
This year, we want to use it again and might gamble with just turning up, (as I have a Gourmet Society card which allows us both to get in for the price of one person) but am a little concerned about not getting in :-S