That is correct the photo's are from the Budge Collection in Retford, Notts.
Actually the full title was the AF Budge Military Collection which was privately owned part of the AF Budge Group.
I worked there from 1988-93 so know quite a bit about the sourcing and history of many of the vehicles. The SU-100's came from Egypt, along with some T-34-122 SPG conversions, a couple of IS-3, the M-48 (which was an Israeli vehicle), some ISU-152, and PT-76.
Later two shipments were made from Israel; including some other Soviet and east European vehicles captured from the arabs, including T-54, T-55, T-62, OT-62, and Archer sp anti-tank vehicle.