STOP!

Do Not take legal advise off a bunch of blokes off of the internet!

They do not have to send you anything for a fixed penalty notice. youre only entitled to the evidence if you've been charged with sometihng (ie itd going to court)

when i asked for proof after getting a fixed penalty, they sent me a summons instead

i then got 4 points and 300ish quid fine rather than the 3 points i woulda got on the fixed penalty!

if youre gonna ask for a pic, do it as a reply to the "who was driving the car" letter. just write back saying it could have been a few people and would they be kind enough to send a copy of the pictures to help identify the driver. DONT do it as a reply to a fixed penalty notice