One further memory from way back.
I was at No2 BFTS at Derby in 1952, on the same airfield they was an RAFVR unit with Percival Prentices, Those enabled Navs and Flight Engineers to get some flying hours in. Much slower than a Chippy, if one was in front of you for take-off had to leave plenty of time before starting rolling or you caught up with it before leaving the circuit.