Leeway may well be allowed - there is ACPO guidance - but it's not a right. 51mph in a 50 zone is a criminal offence and you could be prosecuted for it. Stay within the limit and stay with a clean licence!

With modern digital cameras which don't run out of film the speed can be programmed to 1mph above the limit and thousands of tickets churned out. However every ticket still needs human intervention at some point which isn't available so a 'buffer' is required to ensure the workload is manageable.

Leif - I found the magical motorways yesterday. 230 miles on M4, M5, M42 and M1 in 4 hours (including a break) without going anywhere near warp factor speeds and this included the 20-25 miles of the M1 where there are currently 50mph limits.

Traffic was inevitably lighter than usual, but the roads were far from empty. However there were far fewer HGVs around, which on the dualled A42 makes a huge difference, even with the "no HGV overtaking" section.

Today received a speed fine for a car i sold a month ago. Anyway on the form it suggested the speeds that would attract a tick if hey were 10%+2mph (no worded they way be what they meant). So in a 30 if you have 35mph and upward you are at risk.