try this: -
Dear Sirs
Re PCN <number> dated <dd/mm/yyyy> served at Newgate South Car Park, Pontefract
I respectfully request cancellation of the above PCN due to the following circumstances that caused me to pay for Newgate North instead of Newgate South.
On the day concerned, I parked my car right at the back of Newgate South car park and used my mobile phone app to make payment, which was successful. I did not notice that the app, using GPS satellites, had identified the incorrect car park. I paid the daily charge as normal, (it was the same I had paid many times before), and went on my way. On my return to the car park I was astonished to see that a PCN had been served.
Newgate North and Newgate South car parks lie on either side of Elm Terrace, and are thus only a few yards apart, so I suspect this is what caused the error on my parking app. Clearly, now I have been alerted to this potential problem, it won't happen again. Obviously, the council have lost no money at all from my mistake, so I would be greatly obliged if you could cancel the PCN on this ocasion.
Yours faithfully