I recall that when doing "Combats" during a Mick or Mickey Finn, we would load an inert YS2 (or later, the WE177) weapon that had crew feedback responses. After they had gone through all the motions of setting the aircraft up for combat, the weapon would be removed and used on the next aircraft to reach generation status. Once we'd done the last one the wing was declared "Ready". On one occasion we had anticipated the "Mick" and generated our wing very quickly. Bomber Command HQ challenged us to fly them all off - which we did to their surprise.