In reply to Dave Garnett:
I went this week, wasn't quite as big as I expected, and found the easy problems a bit predictable (too weak and out of pracise to see if the harder problems were the same, and to be fair I didn't have a long session), and the height scared me (but I'm a wuss who can't land on her feet), but in general I liked it - fun training aids upstairs, friendly helpful staff, and so much more convenient for me to get to!
See you down there sometime!