I'm amazed how fit the ex B of B pilots still appear to be, especially Geoffrey Wellum. I gather that when the B of B exhibition opened at Duxford the decibel count from the pilots gathered there was about equal to a Merlin at full boost. Several gave the impression that if there had been a few leather jackets and a couple of Mark 1 Spitfires available then they would have been off chasing the Hun.
With regard to the query about whether you could pull the wings off a Spitfire I heard Ray Hanna refute this at the meeting held to allay the fears of the local villagers round Duxford in the light of this year's incidents. I think I understood him to say that they could withstand something like 20g, far in excess of what a pilot without special kit could withstand. Of course if you had blacked out then those sorts of limits could be exceeded but in "normal" combat you would have been in the relatively safe range of 5-6G.
Perhaps one of the veterans could confirm this if they are on this site.