I've been meaning to go to pay homage to Bletchley Park for many years now. If you haven't been, then I thoroughly recommend it. Fascinating. Absolutely fascinating and if you shut your eyes you can almost imagine them all around you trying to break the Enigma code. Really brought it home to me just how incredibly bright and resourceful we can be.
Close by is the National Museum of Computing and that is also well worth a visit and that's where I came across this little beastie
and a bloke alongside for scale
That's 4Mbits lying there.