Interesting to see the fine limit on the 30 zone set at 35 !
Isle of Grain?
The Association of Chief Police Officers (ACPO) has issued speed enforcement policy guidance, which suggests that enforcement will normally occur when a driver exceeds the speed limit by a particular margin. This is normally 10 per cent over the speed limit plus 2 mph. It also sets guidelines for when it would not be appropriate to issue a fixed penalty notice but to issue a summons instead (see below). Note that these are guidelines and that a police officer has discretion to act outside of them providing he acts fairly, consistently and proportionately.
Speed limit: 20 mph
ACPO charging threshold: 24 mph
Summons: 35 mph
Speed limit: 30 mph
ACPO charging threshold: 35 mph
Summons: 50 mph
Speed limit: 40 mph
ACPO charging threshold: 46 mph
Summons: 66 mph
Speed limit: 50 mph
ACPO charging threshold: 57 mph
Summons: 76 mph
Speed limit: 60 mph
ACPO charging threshold: 68 mph
Summons: 86 mph
Speed limit: 70 mph
ACPO charging threshold: 79 mph
Summons: 96 mph
http://www.cps.gov.uk/legal/p_to_r/road_traffic_offences_guidance_on_fixed_penalty_notices/#speed
Cheers for that , was always curious.