Comet 4 XW626 'Conrod' operated from RRE Bedford ~ 1977-78. I made one (only one) guest appearance during the early radar trials. Flying was disappointing, involving 'wing warping' for roll and gear changes for pitch control.
Most disconcerting was the presence of a test engineer on the flight deck equipped with a radiometer /dosimeter looking for stray energy from the radar waveguide which ran just to the side of the first officers seat (mine)!