I had the great pleasure of meeting some ex-ATA ladies and gentlemen at a do at Lyneham a few years ago. What a splendid bunch they were! They took great delight in telling us about their ferrying exploits. As I recall, the inference was that they generally flew single pilot on the larger aircraft and took the essential operating crew (Nav, W/Op, etc) but no gunners.
One of the chaps had his original set of ATA FRCs with him. They were composed of a card per aircraft; one side was basically how to stop and go, the other had the emergency drills. The Lancaster was the exception as it had 2 cards.
A finer group of people you would be hard-pushed to meet.