Issued on 15th.
Risk-free period for making reps i.e. the reduced penalty would be held, ends on 28th.
I would just submit reps:
Terribly sorry, looked at the CPZ timings online and saw that they ended at **, therefore I thought I could park anywhere within the zone after this time.
I was wrong.
I now know that CPZ timings apply to single yellow lines and not parking places which, as in this case, do not align with waiting restrictions.
Nothing else springs to mind.