More of the usual rubbish from Princemac, I see.
Stick to your guns, Malagabob. If the fixed penalty notice was issued by a police officer (or PCSO/Traffic Warden), in an area where parking violations haven't been decriminalised, then the worst that can happen is that you could be taken before a Magistrates Court, where you could explain the situation and get the matter quashed.
If it was a parking charge notice issued by local authority staff (or their agents) in an area where parking violations have been decriminalised (or by a private company in relation to parking on private land), the worse that could happen is that the matter could be brought before a County Court where, again, you could offer an explanation.
Chris