Well there's certainly no doubt about which letter KH860 flew with!
Many thanks Mikkel, brilliant links! Duly downloaded for reference.
Unfortunately the pics were not exactly what I had hoped for.
My Mustang already has a broken back...
So I guess I just have to continue my search for a Coastal Command crashlanded Mustang, perhaps one back at Peterhead.
Bell's Mustang I might do anyway, though in flight. I've got one ready for paint...
Kyrre