I know it was my fault, I should have read the signs blah blah. It is a residential car park which I have used for the past three years when visiting Canterbury, so I didn't think to check the signage. I've not had any issues parking there until now.
I feel so bullied by this. They chain my car, force me to pay £205 (including a charge for card payment
) and are generally rude and unsympathetic. I feel robbed. 
Does anyone have any experiences in dealing with their cars being clamped by a private firm? Do I have any legal rights? How do I know they're not cowboys?