Hello John,
I have recently looked at the 127 Sqn ORB for September 1st 1944 and found that the a/c that was used by F/Sgt. Housden was PT819, and that of F/Lt. McNally was PT823.
Which could mean that NH543 is after all correct for Lt. Kenyon.
see here -
http://discovery.nationalarchives.go...ils/r/D8436755
Alex