633 Squadron codes

Hi,

I’ve read through the many previous such threads on
this film and subject but wanted to put out a few
further questions regarding some of the aircraft in
this classic film:

Noticed several codes not recorded by anyone
before: “HT-A” and “HJ662 HT-C”, which Mossies
carried these?

Was TA642 damaged during filming or off-camera,
did it carry one of the above codes?

Where did the two Bf108 aircraft come from?

Thanks
Simon