Free Traffic Legal Advice

Thanks for the reply. My v5 is upto date. Also my Son is on tge insurance policy and could very well have been borrowing the car. Point is it's so long ago I've no idea. Our address has issues for the post man and mail goes to many other addresses on my estate.  Its been happening now people are probably getting sick and instead of bringing mail.to our door like I do, maybe they are just popping mail in tge bin, butneither way i never received anything.  I'd have paid a measly funeral in the first place and still would pay it now but I don't want to pay 170 pounds.  Have I made a mess of things by contacting the debt collectors? Is their a particular letter with specific legal terms I can send to let them know innno uncertain terms im not paying and tge reason why?
Regards. 

I have received a letter from dcbl . Its a notice of debt recovery.  Ots for an apparent failure to validate stay or make a valid payment. This was apparently nearly 3 months ago. Their client is Britania parking Group. 
I have never had a letter or fine from Britania nor a reminder. I have no idea what this is for. Plus it's so long ago I can't remember parking in the park in the first place. They want 170 pounds off me. I presume the original fine would be in the region of 60 pounds and had I actually received a fine I probably would have paid it. They say if I don't pay up they will recommend to their client the commencement of legal action against me. At the bottom there's a phrase "This case is not subject to high court or bailiff action. I have contacted them to ask what it's about and to explain i have never received a fine in the first place and they were very unhelpful and told me to get legal advice. 
What should I do. It appears I can't pay the original fine now anyway.  And I would if I could.
Thanks in advance.