My mates son has just gone through a similar scenario. He got a "ticket" from some parking company, which, when you read the small print, was an invoice for Liquidated Damages. My mate wrote to them & asked for a breakdown of the Liquidated Damages & proof of the losses suffered by the parking enforcement company (the car park was mostly empty at the time of the "offence")That was a couple of months ago, no reply, job done.