How does a day pass work for locations outside of all-access?
I'll be in London for a few days, I read it's possible to pay something like 60GBP for a day pass, if you have a membership already.
But I was wondering how it works, are there any restrictions on the time you can use the facilities (i.e. 3 hours or whatever?), can you come back again later in the day? Or are you limited to using it the one time you visit?