The regs:
https://www.legislation.gov.uk/uksi/2022/71/regulation/5They don't 'allow' anything, the law prevents them from demanding a penalty. Pompous oafs!
But no penalty charge may be imposed under paragraph (1) in relation to a parking contravention where—
(a)the vehicle is stationary in a designated parking place and is left beyond the permitted parking period, and
(b)the period for which it is left beyond the permitted parking period does not exceed 10 minutes.
In as much as the 'time of contravention', which is a mandatory requirement in a PCN, can be inferred from the PCN which only states an observation period, this would be 8.53.
The period of 'permitted parking' ended at 8.43.
53-43=10 minutes.
Self-evidently, 10 minutes 'does not exceed 10 minutes'.
The demand for the penalty is unlawful; the PCN must therefore be cancelled.
If the authority continues to gainsay what is self-evident and reject these representations, I shall apply for a costs award at the tribunal hearing.