...and don't forget that as time went on, the Navigator became responsible for overseeing more sophisticated bombing-related equipment such as OBOE, etc.....

( Going back to the 'Mossie engine failure' question, these are just my own thoughts but the Merlins are an incredibly tight fit in the Mossie cowlings and, as with the Spitfire, cooling on the ground was marginal. Also, compared to the Lanc, Mossies relied on pure speed to evade enemy action and detection, therefore the engines tended to operate 'flat out' for longer periods... )

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"Stand by to pull me out of the seat if I get hit" - Guy Gibson