Well, I put together the LoC response above. You may as well send it and make them earn their money.
It won’t change the outcome because they will ignore most of it and still issue the claim. However, besides their fatal mistake of not complying with CPR 16.4(1)(a), it will allow you to use additional points for your defence.
You are dealing with a firm of low-rate, bottom-dwelling legals who really are pretty useless. Have bit of fun with the losers.
Out of interest, the image of the Notice to Driver (NtD), the time, vehicle colour and make are missing. Where thy there and you have redacted them? If so, why did you redact the time of the PCN issue?