That's a nice shot. Unfortunately I never saw the Firefly.
I still can't work out why the second crewmember was flying. I wouldn't have thought his presence was essential to the operation of the aircraft, and after numerous crashes where "passengers" have been killed in crashes, I was rather surprised when I heard two people had been killed.
The RNHF seems to like carrying crew members during displays. The Swordfish usually had a full complement whenever I saw it. Possibly a reward for their interest or something. They don't seem to have much luck with their aircraft.
Most warbirds don't have room for passengers. I wonder how the BBMF goes on with their Lanc & Dak. I know it's not quite the same but I've seen them throw that Lanc around, sometimes at low altitude over the sea. I was amazed how manoeuvrable it is..