That's a tricky one. What does the hire agreement say about parking charges and admin fees? If you ignore the PCN, then they will send a PCN to the reg keeper - depending on what the hire agreement says this may result in them just paying it (and charging an admin fee) or transferring liability and charging an admin fee. If you appeal the windscreen PCN, you will give away the driver's ID. It's not clear which of the T&Cs they are alleging you have breached - possibly if you were seen walking away, then they are assuming that you are not a patient (or visitor) - but that's not actually what it says nor does the sign say anything about that (it says patients and visitors, but doesn't specify what that is).
The lady giving out the PCN Saw me walking away. Can i not appeal as the hirer? It does give me the option to appeal as the Hirer on the system.
T&Cs from the hire company.
Your Main Obligations under the Rental Agreement
(a) You must:
(xv) pay any administrative fines, fees, charges, costs, penalties, or other fines that are imposed, issued or incurred in connection with your usage of the Vehicle during the Rental Period (including usage of the Vehicle by Authorised Drivers or other third parties you permit to use the Vehicle), such as fines or fees for illegal parking or speeding, non-compliance with bus lane, congestion charges, tolls or violations of the rules of the highway or traffic offence or contravention in any country, in all cases, to the extent permitted by law and unless caused by us.