I received a parking fine back in October last year when I was parked in a car park that a pub / restaurant shares with a couple of office buildings in Birmingham. I was at the venue (The Highfield, Edgbaston) all day for a work event, and I paid for parking using RingGo. Because I made payment, I couldn't understand why I had received the fine, but it appears that I parked in a spot that belonged to one of the offices rather than the venue I was in, completely unintentionally. The venue's section of the car park was not full, as were the office spaces, this was just a genuine mistake where I parked in the wrong spot. The photos from the claimant (DCB Legal) show signage that I was in the wrong space.
I have moved house since the fine was issued and haven't informed the DVLA or the parking company / debt collection company, so the letters are going to my old address. Luckily I am in touch with the person living in the address and they have passed the letters on to me.
Today I have received a letter from the HM Courts & Tribunals Service saying a claim has been made against me, and if I don't respond to the claim, the claimant could request a CCJ. I'm looking for advice on this, and what is my best course of action here. The debt has now also increased to £264.16, which I simply cannot afford to pay, and as this was down to a genuine mistake and I did pay for the parking, I don't feel like I should pay it out of principal either. But at the same time I definitely do not want a CCJ to be issued against me. I have attached pictures of the letter received, but haven't included the response pack as I believe this to be standardised.
Any advice you can give me on how to handle this is much appreciated.