Thanks, Dan,
Did the RAF's C1s also have an APU? We could certainly have used one in West Af for air con, and of course some of the air trucks on offer were pretty poor on hot days for engine starting.
BCAL's Standards – including G-ARTA, the ex-prototype – also had what was referred to as a "super" wing, enabling FL430, as I said in a previous post. Unlike the real Supers, there was a characteristic "droop-snoot" L/E near the tips. Did yours have that? We also had freight doors, except perhaps on G-ARTA.
The Ten at Brooklands is oor ex-G-ASIX, I believe.