In these days of CGI it is great that real aircraft were used in making this. At 46 mins there is the sequence of the attack by two Bf109s. These were genuine DB605 engined 109's, albeit one of them re-engined from a Buchon. The sequences were filmed at Sculthorpe. The initial takes of the head-on shot were lower and the pilots were asked to fly it a little higher so that they did not have to climb to go over the camera car (the cameraman was on the roof). For the shots around the buildings the pilots requested that a flag pole at the end of one of the huts was removed because it was a collision risk; the request was duly granted. What great fun days ....