Free Traffic Legal Advice

Good evening I have received a letter from the HM courts and tribunal service from private car parking fine I received some years ago I initially contested the fine and heard nothing back afterwards years later they have sent a letter to my mothers house where the car I was driving at the time was registered (since been scrapped) I have attached the letter sent firstly I’m asking if this is an official letter or are they trying to intimidate and if it is official is there anything I can do? I would obviously prefer not to have a CCJ in my history. For context I parked on a private carpark advertising £2 for all day parking they sent a letter saying I overstayed I contested this as ‘all day’ is quite vague and I expected it to mean 24hrs not 12hrs. I do not have the original letters as it was over 3 years ago

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