So this morning my DH has discovered he has incurred a parking fine for a carpark we often use of £100 which they will kindly reduce to £60 if he pays before the end of the month.
He paid for parking at an ANPR carpark and used their online system as he had no change on him. Except the car registration on the online account is his old registration and therefore the company are claiming we have not paid to park as our new car is shown entering and leaving but does not show as being paid for.
Is there any point in arguing the fine? The company have not lost out financially, he didn't over stay and it was a genuine mistake not an attempt to defraud them of £4 as they so kindly state in their letter. 
Helpfully they also have no phone number. So I now also wondering what I should say to clearly get my point across in an email which will probably not even be read by a human being.