I think the Cray 1S was at Farnborough, I hadn't heard of there being one at Bedford.
The flight simulation complex (in which I worked) comprised I think 5 Gould Concept 32 computers running at around 5 MIPs each.
There were several motion systems, a couple of projection domes ant the cube shaped advanced flight simulator (AFS) in a building 80 feet high, which pilot Les Ellingham decided to use as an aiming point and overfly at below 80 feet in a Lightening. Never actually saw it, but I certainly heard it! Unforgettable.