BB, combat rules, you just might have been lucky. No notice check and if only 2 crew members present they still got all the questions to answer. I remember one uncomfortable interrogation by Joe Sievright, I just did not understand the question "how would you get to your target"
Few wing staff took that responsibility seriously. It was certainly mandated. Jock McColl was more interested in golf. Joe Quinn didn't get involved. Bill Cooper did until he managed to lose the responsibility. Dick Emerson and John Stanley didn't know there was a Vault. Spike Hughes was too busy doing his multiple secondary duties and his replacement, Digger Booth just kept his head down.
In Cyprus we still did target study and had two or three keen wing staff. IIRC we only covered 3 targets as there was no QRA and no sqn detachment plan.