A1 grantham speed camera

Franglais:
Link to Lincolnshire Police.
lincs.police.uk/reporting-a … /speeding/
It seems they do go with the 10%+2 threshold. As said that is widespread, but is not the law. Go one emm over and you are law breaking. Highly unlikely to get nicked, but no guarantees.

I reckon the OP might be OK. Most car speedometers overread by up to 10%. So an indicated 80mph might be as low as an actual 72. Then factor in the device tolerance quoted by the police and that would probably take him below 70.

OK you can’t (and shouldn’t) rely on it but it’s a get out of jail card