Was anyone tailgating you Sid ?
You could use "special reason" plea to avoid points etc.
Was the new speed limit clearly signed and were all old signage removed ?
A case here of a reduced speed limit was questioned when a bloke received a ticket, checked the road and noticed they had left the old limit signs up FFS

So it's always worth doing some digging.
He got off but thousands of others had been charged. When asked if the other motorist's would be reimbursed, the filth replied "anyone who comes forward will have their case reassessed," .
Yeah right, thieving scum.
Did you receive it within 14 days ?.
You can reject it if not.
Ask to see the camera calibration report to check its not out of date.
Take some vaseline and pain killers with you for when your in your cell
