DFCP: If it helps at all, I believe the date of that crash at Yorkton was 17th August. No need to go into who etc, just another wartime crash...
I have located a serial for the Halifax as NA317 giving similar details as you, perhaps same source, but Squadron OCTU/HCU lettering just doesn't seem right.
I'm afraid there were simply too many RAF casualties (let alone the Allies) in the first two weeks of March 1945 to locate a Halifax crew and two u/t casualties. Nothing came up on Abbots Bromley as a crash location. (Not that I'm querying the veracity) just tracing who it might have been.
Great to have you here, please continue!