Do you mean Met Research Flight? They were only a lodger unit ie not part of the RAE Experimental Flying Department due to Farnborough being the closest MOD airfield to the Central Forecasting Office at Bracknell (now moved to Exeter), and although the aircrew 'mixed' they were regular Lyneham crews rather than specialist aircrew who had been through ETPS or similar.
Another 'lodger' was IAM (Institute of Aviation Medicine) Flight which normally had two pilots, both qualified as doctors and both qualified jet instructors. A third was added shortly before they moved to Boscombe; he was a qualified test pilot not a doctor and before he was allocated to IAM Flight he was an EFD pilot on fast jet types with whom I had the pleasure of a Hunter flight one day
MRF had, prior to 1981 when they became single type on WX208, numerous types, and a large team of civilian scientists and engineers, but I agree that they didn't use TPs.
Aerodynamics flight however, were RAE and did do quite a lot towards basic understanding of aircraft aerodynamics, as well as stability and control.
P