what to do in london this saturday...

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...that isn't SUPER CROWDED?

I am in London to meet a group of friends for lunch, but don't want to schlep into Londinium just for that (as it will cost around £15-20 just to travel in)

Any ideas? Can't do manic crowds as DH and Friend suffers from anxiety

Gingerbread city exhibition at the V&A
Wildlife Photographer of the year exhibition at the NHM. I go every year and it's a lot better than it sounds!