BB, I didn't say that 609 were at Manston. I merely said that 'Bee' Beamont commanded 609 and he was at Manston - in any case many aquadrons were temps at Manston at the height of the battle and some go unrecorded.
As far as the 'mutiny' was concerned it is clear that as Len Deighton says, the guys would not come out of the shelters.
The reference to Sdn/Ldr Cardew was taken from the write up in the Squadron history on Google. Often not case perfect I have to admit.