In reply to The New NickB:
> That sounds contrary to the British Parking Associations own guidance. The relevant reference would be "observance period".
Yes, and that period may vary between authorities but it's usually reasonable (at least 5 minutes)
I am proud of having once successfully challenged/overturned an attempt to fine me, from the notorious Camden Council, some time in 2001-2.
Central London. Parked outside my office (uni department), entered, went upstairs, had a wee in the toilet and picked up a rucksack.
I was gone from the car for 3 minutes. I know it was 3 minutes because I was timing it as I had spotted two traffic wardens nearby as I parked up and was thinking "aye aye..."
There was a PCN on the windscreen by the time I got back to the car, and no sign of the traffic wardens. Some timing tests indicated that they must have already been keying my registration in before I even indicated to pull over, printed the ticket whilst walking, placed it with hardly breaking step, and then walked VERY BRISKLY away. Ticket stated "observed 17:20; issued 17:22".
Checked their guidelines, available online. I was allowed 20 minutes there for loading, as long as I was actually loading (which I was). They were supposed to observe for at least 7 minutes before taking any action.
I outlined this clearly in my appeal letter.
Their reply, overturning the ticket, had the gall to say "as this is your first offence, we will waive the penalty charge". Part of me wanted to continue a correspondence, building it up into some accusation of slander etc, but I saw sense and just left it, given that I had achieved what I wanted.
I dimly recall that I actually had to physically go to their office for some part of this appeal process.
Related - I once did 6 weeks of temp work at Haringey Council's parking fines appeals office - a whole office dedicated just to the appeals. 6 full timers plus me. In my 6 weeks I did not see one appeal upheld.