An uncle of my father was one of the techniions at Bleechly Park during the war, I visited him when I was last in UK in 1984, what an interesting time I had, before that I knew very little of the existance of the place, and it's vast size. At the time he was CEO British Nuclear Fuels, and he took me on a tour of thier 1950's vintage computor at (?) Nutsford. near Cheshire, that was big enough, but you could probably do most of the work it did on your smart phone today.
Ian S C