Depending how far you want to go with this, if your friend gets his father's service career details you should then find out which squadrons he was in.
You should then find a squadron equipped with Lancs - perhaps Coastal Command.
With that info and the dates he was with that squadron, you can arrange for a check of the Squadron's Operations Records Books (ORB) which are held at The National Archives, Kew on microfilm (one day they might appear on-line perhaps). The ORB will list all flights by that squadron with aircraft number, crew names and times of flight, start and finish locations. It may also have information about any unusual actions, such as filming.
Also with a squadron number there maybe Squadron Association.....
I appreciate you are in Australia, but that's the theory anyway!