It's Fred
Ayris Low Ball. He too was subsequently commissioned, but not before he'd got the AFM - not sure what for. He was also subsequently in the Whirlwind which flew into the hangar at Valley ..... but maybe
Oldbeefer could tell us more about that.....
As for Navs,there were a couple still on 72 Sqn (Wessex at Odiham) in the early 70s, one was an aged Master (Warrant Officer) but one was a (relatively) young-looking Flight Sergeant. I'll dust off Vol 1 of the log books and see if I can find a name.
Taff Walker was indeed the last flying non-commissioned pilot in the RAF - for that he got his picture on the cover of Air Clues when he retired.