What I mean is I don't remember exceeding the limit, or any speed cameras going off, I was definitely on the road at that time. Is there a way that you can check that the speed limit was 40mph, or do we just have to accept the Police's word for it?

Hello, I've received the following NIP: Issue Date 12/8/2014 Date of Offence 22/7/2014 Time : 20:14 Location : M5 Jnc 16-17 Southbound S. Glos Offence : Exceed a variable speed limit 40mph - automatic camera device. The recorded Speed was 52mph I have no recollection of the offence but question the variable speed limit being 40mph on the M5 at 8:15 on a Tuesday night, there is nowhere on the NIP where you can view the evidence like some police forces do. This is a company car so explains the delay in me receiving the notice. I'm anxious to avoid this one as this takes me to 9 points and perilously close to a catastrophic ban. Any ideas for a defence? Many thanks,