Tim/Mirek,
Even Müller claims a Hurricane on the 27th Sept - 151 Wing lost none.
http://www.luftwaffe.cz/mullerr.html
17th Sept 1941 - one Bf110 credited to 81 Sqn by Soviet Observation Corp. (no Hurricane pilot claimed/had a combat with a Bf110 this day).
6th October - records say 2 Ju88, 1Bf109F (E with pointed spinner), 3 probable and 4 damaged.
As for Griffin's book - he was the Adjutant. I have all of his diary notes and rough typed reports (from his daughter).
regards
Mark