I visited a Volkswagen dealer in Victoria Road, Ruislip. This road has many small retail parks. I parked in what I thought was the retail park in which the dealership was located. I have taken a photo that shows how the dealership appears to be part of the retail park.

I was given a ticket and went to the nearest retail unit (a furniture shop). The assistant here said that the parking enforcement was arranged by the landlord of the retail park - not by the shop. He showed me the chap issuing the tickets hiding in his car. The operative told me that VW was not part of the land owned by the freeholder.

I asked him how he knew that I wasn't a customer of any of the two other shops in the retail park. He showed me a sign that states that anyone visiting VW (whether or not they also visit the other shops) whilst parked will be given a ticket.

Is this fair? Can this be enforced? I have a photo of the sign. I was in the dealership 20 minutes. The fine is £100 reduced to £60 for early payment.
The VW dealership is trying to come to an agreement with the freeholder - but have so far been unsuccessful. Whilst returning to my car I warned 4 other people about the restrictions - too late, the operative had already ticketed them. I reckon that he was issuing about a ticket every 2 minutes.