The BBMF HAS DUAL CONTROLS which is a recent modification
all lancs in the war didn't have a copilot or a method of dual controls
After many years of reading books about WW2 RAF bomber crews I have frequently seen references to a pilot of a new crew flying as a second pilot with an experienced crew for his first op. He was referred to as a 'second dickie'. From what I can remember a second set of flight controls was fitted and he used the flight engineer's fold-down seat next to the pilot.
Polecat