The problem is worse outside London, hotels in conservation areas that get planning for health clubs on the basis that locals can buy memberships too, then quietly withdrawn. A car park that should be open for public paid parking becomes private.

It's a fantastic idea, but enforcement sucks on intangible things like this. In a few years time I'm sure it will be 'closed for maintenance' then never reopen to the public or a nice restaurant will go up there and suddenly you'll need a restaurant booking to use the lift.