This seems to be a link to some of the imagery

http://aerial.rcahms.gov.uk/worldwide/?PHPSESSID=bojd1mia9369ftfv10augie007

Nothing for bolougne but maybe you could contact them? As you have a date and Squadron then locating the film (if it still exists) would be a 5-min job, assuming they have access to the original JARIC search system.

It would even have a sample of your great uncle’s handwriting as all films are usually accompanied by the original paperwork that would have been filled out by him during the sortie (at worst it would be a photocopy).