Jody
Stubborn git
There are speed cameras in 20mph areas though, so there must be enforcement through NIPs?
Merton has a 20mph speed limit on all roads I believe including a previously 40mph dual carriageway (not that there is much enforcement in the borough)
There may be in other parts of the country but to my knowledge there are non in Sheffield 20MPH zones. NIP would need an officer to conduct speed checks and they CBA with it.