Does the SJPN list just speeding?
As far as your questions go:
- Is 46 mph within the allowable threshold, given the 10% + 2 mph tolerance rule?
Dealt with above.
- Should we request the calibration certificate to confirm the speed reading's accuracy and consider contesting it?
Does he believe it is inaccurate? Or is he just considering "fishing"? In any case he hasn't got much time to consider it as the SJPN must be responded to in 21 days.
That stretch is covered by an average speed system. There is no speed measurement as such. A camera takes a photo at the beginning and end. The elapsed time between the two is used, together with the known distance to calculate the average speed. There is little to go wrong.
- Could the decision to issue an SJP instead of a fixed penalty offer be influenced by his German driving licence, and what
would be the best way to proceed in this case?
It could be influenced by the fact that they may not have received his initial response (hence my first question). Why did he respond twice? But other than that who knows? He could try ringing the ticket office to find out why he was not offered either a course or FP (that would also answer my first question).
He may be pleased to learn that the stretch is reverting to National Speed Limit (70mph) at the end of this month.