It's not brutal, it's boilerplate, intended to intimidate you, and legally flawed.
By entering and parking the vehicle on our client's private land, you agreed to enter into a contract with our client
- no, the driver entered into a contract, you didn't. They can't suddenly switch from "the driver" to "you" without either your admission of being the driver or by the valid use of PoFA 2012.
Just search the forum for loads of similar examples, as already advised. We will help you but you also need to help yourself.
Don't respond. Think about a defence for the county court claim which will follow.