Ah Ha, another Auxilliary Air Force squadron! And my 'local' squadron at that - 'County of Chester Squadron. Nice choice.
Probably one of the most seen photos of the BoB shows the Squadron airborne over Gravesend - can't miss 'em with those over-sized code letters !!
Oops Just noticed - must have misread the title, I thought it was 610 Squadron ! If it's 601 'County of London' Squadron, as in the thread title, then there's a big problem ! The Squadron didn't get Spits, MkVs, until March 1942 - they flew Hurricanes during the BoB, coded UF.