Here is a possible response letter for any [PCN] Parking Ticket Notice, from a council or county in the British Isles. Please amend as required, and try to make alterations so as not to send the exact same letter each time, but keep the questions the same and you only want yes or no answers nothing else.

In care of: John: Doe 
Correspondence Address Only
Bla Bla Street, England [postcode]

To: [Parking Scamsters, Bla Bla Street, [postcode]
Date: 00/00/2011 
Re: Penalty Charge Notice: xxxxxxxxxx 
Dear Sir/ Madam
I writing in response to your claim for £110.00 supposedly due in relation to an alleged parking contravention, the penalty charge notice XXXXXXX issued on date 00/00/2011.
I wish to resolve this matter as soon as possible, but at this point I do not have enough information to make a determination, so before I cannot proceed any further in whether to dispute or pay the fine. I am asking that you better inform me, as to the nature and cause of the alleged offence. This letter is not intended to be a formal representation, but should the questions contained be ignored or otherwise not answered in a meaningful or honest manner, then please do consider this communication as a representation to reject the alleged claim on grounds there has been no valid claim presented on the grounds no factual evidence has been presented, under the rules of natural justice and or common civil law procedure. So please read this carefully.
Please answer “yes” or “no”, to the following questions and I would appreciate you providing me with the necessary evidence, proving you have a valid claim. I am neither admitting nor disputing the alleged liability at this stage; I simply require further verification and presentment of the facts to your claim. 
1). Am I considered innocent of the alleged Traffic Contravention. 
”please answer “yes” or “no” 
2). Does the Road Traffic Act, create or impose an obligation or Legal duty upon me. ”please answer “yes” or “no” 
3).Does such an obligation require my voluntary cooperation.  ”please answer “yes” or “no” 
4). Can you provide me with evidence that the road traffic Act, applies to me.
”please answer “yes” or “no”
5). Can you provide me with a factual timeline, to show were, when, why and how this alleged obligation was created? ”please answer “yes” or “no” 
6). Are there any witnesses with personal first hand knowledge of this alleged obligation.  ”please answer “yes” or “no” 
7). Does your claim present a “valid cause of action”, to any competent Court of Law, that has jurisdiction in this matter?  ”please answer “yes” or “no” 
8). is there any legally admissible evidence to prove such an alleged obligation. ”please answer “yes” or “no” 
9). is your claim in the nature of a “Contract”?  ”please answer “yes” or “no”    
10). is your claim in the nature of a “Tort”? ”please answer “yes” or “no”
11). is your claim in the nature of a “Complaint”? Please answer “yes” or “no”  
Please also provide additional information to the following questions.
1b). what proof do you have that the vehicle Reg: [XXX XXX] was present within the [London Borough of Scamsville] at the time of the alleged offence. 
2b). what evidence and proof do you have that, the “London Borough of Scams Ville” has a belief or beliefs that a penalty charge is payable. (As stated on the notice).
I ask that you keep your answers responsive, and only in relation to the relevant facts being asked for. I must make it clear, that I do not seek interpretations, quotations, personal opinions or opinions as to the road traffic Act etc, or on points of law. 
Look forward to timely response