As noted by several others, a feature of the V Force in the 1960s was the apparent belief that crews needed to be continually fed. The operations blocks incorporated a kitchen and dining room, complete with white coated stewards, that remained open throughout the flying programme. After self briefing the crews would settle in the 'aircrew feeder' for a three course meal. Loaded on to the crew coach would be a large box stuffed with tins of soup sandwiches, sweets (often teeth ruining polos) and assorted cold drinks. It was the co pilots job to lug this about. Some resented the chore, but they were encouraged to think it was all part of preparation for captaincy. On landing it was back to the 'feeder for another blow out. And if it was the right time of day, you could be back to the Mess in time for dinner. Later, the entitlement was cut back - if you flew ,say, a one and a half hour air test you no longer got the after flight meal - it was a bitter blow
It would be interesting to know why V force crews, and no others, were provisioned in this way. it was once thought to be aero medicine factors but what about other roles. Many were more demanding that V force flying, eg Canberras in RAF Germany. Their crews just had to make do.