RAE Bedford operated a range of aircraft, some on permanent inventory others as visitors for trials involving other RAE departments or civilian developments.
Circa 75-80, the only BAC 1-11 was the 'BLEU' aircraft XX105 (BLEU became Flight Systems 2, AERO flight FS1 circa 1974, then amalgamated to become Flight Systems Squadron ~ 76).
However, a BAC owned 1-11 may have visited during the BAC reduced stability, Smiths fly-by-light, and RAE Versatile Autopilot trials.
There were many visiting helicopters for comparative agility tests, the agility course was on the airfield and likened to horse jumping/eventing. A Scout or Gazelle was probably used during the helicopter combat flights; fast jet pilots guested as test engineers (extreme manoeuvrfes) and to compare tactics.
The dedicated simulator research facility (FS1?), was SW of the hangers on the airfield site; this involved research into simulation, per se, and was also used for project evaluation. IIRC it had a multi seat moving base simulator, which may have been reconfigurable as a single seat aircraft. I also recall a VSTOL facility, Harrier and helicopter, but this might have been the same system as above.
There was a separate fixed base simulation with a moving belt visual for fighter agility / weapons aiming.
FS 2 had a simple fixed base simulation for night low-vis evaluation; this was extensively used for airfield lighting, flight director, and crew procedures research. Some of this was in conjunction with the Hatfield design sim (DH/Smiths LED para visual display), and the Weybridge Advanced Flight Deck.
A visit to the wind tunnel model shop was always a must (unfortunately often in conjunction with a visit to the site Boss *). As well a viewing 'what's new models', the very skilled modellers could repair one's most valued presentation solid aircraft models and create all sorts of presentation gift mountings.
* the ultra low level (50ft) high-speed flight test course started adjacent to the head-mans office, which being on the second floor might have looked down on the passing aircraft. The straight line track ended next to the airfield ATC tower.