Ontariotech:
Have you managed to find a copy of the Operational Record Book of 75 Squadron? There's usually (depending on the officer who compiled it) some interesting stuff to find in those...
Other contacts might include the Air Historical Branch, at
http://www.raf.mod.uk/history/ahb.html or by mail (Ministry of Defence/Room G1/Building 266/RAF Bentley Priory/Stanmore/Middlesex/HA7 3HH/United Kingdom)
or RAF Museum
www.raafmuseum.org.uk, or by mail Grahame Park Way/London NW9 5LL/United Kingdom.
Both have been invaluable to me in doing similar research... my grandfather's uncle (412686 W/O R.W. 'Jack' Purcell) was a Lancaster navigator with 467 Sq, shot down and killed over Lille in France in May 1944. Among other things, researching his story led to us meeting and becoming quite good friends (up until his death a few years back) with Jack's pilot who was the only survivor of the crew.
Lest we forget!!