A mates sister parked at Robert Peel hospital Tamworth, they have some camera system that detects the car reg and a pay as you leave (no barriers) system, 5 days later she gets a £70 "charge", she was in her husbands Mondeo but entered her own reg (Ford Focus) when paying without thinking.....

Unusual? Nah, standard fare on here.

Which PPC please?

He has just said parking eye

Give them the 'correct' registration - they should be able to x-ref the registrations (i.e. one was detected/the other wasn't)