Thanks all for your comments. The producer and driving force behind this film is Doug Harvey. Doug lives in British Columbia. My father, Alex Campbell, is following this thread, with interest, from his home north of Toronto. I have posted some pages from Dad's log book here:
http://www.hilaroad.com/RCAF/pages.html
Pages 59 and 60 cover the events of July 28, 1944.
Look closely at the last entry on page 59, it was printed by someone else when A2-C failed to return.

E.W. Campbell