I have received a PCN through the post alleging failure to abide by a Keep Left sign on the motorbike registered in my name. I have written to ask for the photographic evidence (not supplied in contravention of the London Councils CCTV code). The alleged offence occurred on 1 June and the PCN is dated 17 June, received by me on 22 June. Is there a statutory period within which a PCN must be issued to be valid i.e. as per a NIP for speeding which must be issued within 14 days of offence?

Secondly. I am fairly sure that the time stated on the PCN is an hour later than when the "alleged" offence occurred. Can I demand a time-stamped photo and if the time differs from the time quoted on the PCN, is this grounds for cancellation?