Just a heads up for anyone who may find it interesting. I went to it yesterday. It was my revenge for going to a boring museum in the morning
There are a whole bunch of arcade machine classic you can play on (think space invaders, galaxian, centipede etc). Pong on a big screen, I beat my dad 10-0 and wife 10-1. The rest of the exhibition is mostly a selection of console games up to the present day. Not much Amiga there though, other than one running lemmings.
It will cost you £8.5/ticket to get in. Could easily spend several hours in there if you aren't dragging along someone who doesn't find it interesting.