UPDATE:
Hi All,
To recap since this post was last year - a relative foolishly duped into paying someone to 'deal with speeding letter', he gave the subsequent police letter to the same people, eventually police wrote to him saying (paraphrased) "this isn't true, and the address/ details you gave are from a nip farm". I subsequently asked here for best suggestions/advice.
I wanted to send an update on this as promised, as others had made contact that they were in the same position too. ('NIP farms' etc)
I recommended the advice given here. He replied to the letters with minimal information, not saying anything more than what was asked/ needed.
His hearing was postponed once, but finally took place a few days ago. He did not attend (as advised).
He was concerned he'd receive a ban or much worse ie a criminal conviction.
He received a letter today giving him 6 points. I couldn't see the offence code on the letter, but loaded the letter to chatgpt which has said it is an MS90, inferred from the reference to "section 172(3) of the RTA 1988". Nothing on the letter about a fine.
Thanks again to those who helped, and all the best to anyone going through the same. Lesson also to those tempted to use those scammers - they left him high and dry and just stopped answering his calls when sh*t hit the fan, despite all their promises when he first paid them. He only mentioned it to me when they had already replied to two letters for him then gone AWOL, probably because I would've told him it was a bloody stupid decision in the first place!