Thanks for your response.
The photo of the sign you have showed us does not appear to be a sign belonging to CPM. How the car park area is delineated could be important.
One possibility I can think of, is that the car park is for residents of the block it is adjacent to, but only if they register their details with Westminster City Council (given the "vehicle not registered" comment on the PCN). The bays do not seem to be allocated to individual flats and are all unmarked except for the one disabled bay stating for "LL14".
The GSV views are too old to be of any value. We would need to see the current signage, preferably under the same lighting conditions at the time of the alleged contravention.
I agree the GSV views are 3 years old but I promise that it accurately reflects what is shown today. I can't get any photos of that area until mid June.
For any contract to have been made, there must have been an entrance sign that clearly informs the driver that they are entering private land and that parking terms and conditions apply. Once on the land, there must be sufficient signs that adequately bring to the attention of the driver what the terms of parking are.
The only sign mentioned on entrance is the one provided in the opening post, and matches the GSV views.
Did you park in a bay marked as for the use of people with a disability? If so, there should be a sign with all the parking terms and conditions that can be read by the driver without having to leave the vehicle. Is that the case?
The car was stopped, while still occupied, in an unmarked bay for 10 minutes. Not in a bay marked as for the use of people with a disability. I'm unsure if the agreed definition for what a "parked" car includes whether or not the car is occupied, and if there is any time limit, and if the car must be locked or not.