Free Traffic Legal Advice

I have been sued by a law firm for parking at car park for a retail park and leaving the site. In the correspondence leading up to issuing the claim they alledged that I had "accepted" some "terms and conditions" and by leaving the site I am in breach of those terms and conditions.

I am the registered keeper and assumed it was a free car park as it is a retail park. It seems from the correspondence that it is free but you are not allowed to leave the site.

It was the first time I went to the park, I have no idea what they are talking about and replied to them twice explaining this. All I got back was standard, computer generated letters and then they went to court.

In the "Particulars of Claim" on the court papers it just says:

“The defendant is pursued as the driver of the vehicle for breach of the terms on the signs (the contract). Reason:Driver Left Site Designated For Customer Parking Only”

I wrote filed an "Acknowledgement of Service" and wrote to the law firm asking them to provide more detail as to what the terms are and how I agreed to them but they have not bothered to respond.

They are claiming £263 which seems ridiculous given it was a Sunday morning and the car park was virtually empty.

The question is what do I do next?

Any help would be appreciated.

Thanks