Hawker Hurricane V6722 A/C designation

[RWVose]

Hello,
I'm doing to research on Hurricane V6722 flown by my 2nd cousin Sgt SA Fenemore who was shot down and killed on 15/10/1940 while serving in No. 501st Squadron.
I'm specifically looking for V6722's aircraft designation at the time of his crash but have been unable to determine the letter.

Based on the last entry of his flight log on 12/10/1940 he flew in "M". It has been suggested that V6722 was aircraft "M", however in his last 8 sorties from 7/10/1940-12/10/1940 he flew in aircraft "J" four times and "G", "A" and "M" once each.

Any help would be much appreciated.

Regards,
RW Vose