He records that he needed to do five take-offs and landings in a Lancastrian in order to be qualified on type.
In the Propliner article referred to earlier, author Don Brown, who was taken on at BSAA to manage pilot documentation records, wrote of some decidedly unofficial previous practices. One man was taken on from the RAF as an FO, qualified on Lancasters. One day he was assigned to a York to take it down to Africa. When he pointed out what appeared to be a scheduling error he was told "Oh, a York's not much different to a Lanc, on you go". With passengers on board !