Should I wait for the council to send me the extended video footage, which should show me reversing out of the zone,before I submit a letter of appeal?
There is no extended video footage, the camera records so many frames when an event is detected, nothing else is saved. Here's a better draft:
Dear London Borough of Camden,
I challenge liability on the basis of de-minimis: as the video shows, I realised my mistake and immediately reversed out. I did not therefore gain any advantage over other motorists and no traffic management purpose would be served by enforcing this PCN.
I trust that in the circumstances you will agree to cancel the penalty.
Yours faithfully,