You can also access the Squadron F540 Operational Record Books at Kew. They are very helpful and you can order a reader's ticket online and reserve documents ready for your visit online also.
Start here
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If you / he want to check up on where his less fortunate crewies now lie,
:: CWGC ::
I did some research for a friend of my grandfather recently. Incidently, my grandad may have patched up your dad's planes - he was a RAF panel beater near York.