To succeeed with a Norwich Pharmacal order the applicant has to show that it is in the public interest. That was undoubtedly so in the original case. Lord Reid and Lord Cross stated that a party concerned about the propriety of making such disclosures was entitled to require the matter to be submitted to the court *at the expense of the person seeking the disclosure*. In other words, they could go to court but at their expense, win or lose. There are no precedents to my knowledge of a private parking company going to court and attempting to obtain a Norwich Pharmacal order as the costs would be prohibitive. It is simply not viable to bring an action on the basis of an alleged (and dubious) speculative invoice. The best advice is to tell them to "bring it on" and I will happily run any case for you free of charge should they do so.