I actually have been in the room where they torture him in that scene. Brunel University lecture centre on an open day. Glad I didn’t go there in the end as the halls of residence were used for his hospital stay and hadn’t changed a bit since they filmed the damn thing.
There's a shitload of things that have been filmed at Brunel. Being convenient for Pinewood Studios (and to a lesser extent Shepperton Studios) and being essentially empty for the summer lends it to location shoots for all sorts of productions.
The Sweeney held a bank robbery and shoot-out there.
Purdey of the New Avengers kicked in the door of "Alice's Restaurant" (The New Avengers used it several times I believe).
The Comic Strip Presents burned down a fake primitive village in front of the Lecture Centre and also used the main entrance, Sports Barn, Science Building and Union Bar as locations (where one evening I got steaming drunk with the whole crew including Rik Mayall, Ade Edmunson, Robbie Coltrane, Sandy the director and all the other usual suspects).
Morse and Lewis were always going to a pathology lab that was really the microbiology lab, and other locations at Brunel.
Peter Cook filmed scenes from The Rise and Rise of Michael Rimmer there.
And that's just those I can remember off the top of my head.