Here is a photo of the sign in the car park:

On thing to note on the sign - it says "registrations need to be validated outside of store opening times." PureGym Byfleet is a 24 hour gym so it's effectively always open. Does that, by the letter of the sign, exempt the parker from the need to validate their ticket if using the always-open gym?
The parking policy has been changed recently. Previously there was no need to ever validate a registration number at any time of any day.
On PureGym's website they now include this caveat:
When visiting outside of the following hours, please validate your parking using the QR code in the entrance to the club:
Monday-Saturday: 8am - 10pm
Sunday: 10:30am - 4:30pm.However using WaybackMachine to look at the website in October 2025, that bit of text was not present. So the parking policy has changed but it wasn't relayed to the gym user / parker.
This has been challenged with PureGym directly and they accept no liability other than to direct towards the PCN appeal process with ParkingEye, and to use data from the App to show the gym session at the time of the parking.
Any suggestions?
Many thanks