OK here is my draft for the initial contact:
This Parking Charge Notice was served outside the 14-day statutory deadline required for keeper liability under Schedule 4 of the Protection of Freedoms Act 2012. As a result, keeper liability cannot arise. Further, if this site is situated on railway land, it is in any event not “relevant land” for the purposes of PoFA, and keeper liability is expressly excluded regardless of service dates. In either case, the Operator has no lawful basis to pursue the keeper. Accordingly, this charge must be cancelled or, in the alternative, you must issue a POPLA verification code.
Additionally, the Operator has issued two Parking Charge Notices in respect of the same single continuous period of parking. Only one parking contract can arise from one uninterrupted stay. The attempt to pursue multiple contractual charges for a single parking event constitutes unlawful double recovery and an abuse of process, and is contrary to the BPA Code of Practice requirement that enforcement be fair and proportionate. On this basis, both Parking Charge Notices must be cancelled. Should you reject this appeal in respect of either notice, you are required to issue a POPLA verification code without delay.