In the early days of 360 (late 66 or early 67 ) and we had few aircraft, some of us did some flying for RRE at Pershore- max 2 1/2 hour trips, land by 1630 or go elsewhere, no flying if rudder locks needed, down below 10,000ft and hot soup at half time and electric socks - fantastic. The aeroplanes were immaculate as well. I remember one trial required the nav or AEO to lie on the floor by the exit door lining up a chinagraph mark on the canopy with another Canberra flying several thousand feet higher.