Is there?
That's news to me................I think it is obstruction.
Yep - from the DfT..
Visibility of fixed cameras
"Speed camera housings must be coloured yellow. Housings must be visible to road users and not obscured e.g. hidden behind bridges, signs, trees, bushes or other types of obstacles. The minimum visibility distance should be 60 meters where the speed limit is 40 mph or less and 100 meters for all other limits."
Signs
"Camera warning and speed limit reminder signs must be placed in advance of fixed, mobile or time/distance speed enforcement taking place. For fixed sites, signs must be placed within 1 Km of the housing."
Surely this means that the Police / Camera Partnerships are guilty of obstructing themselves?
As with the Forum giving details of undercover vehicles - it needs to be obstruction with both motorists and cyclists if we are to take this seriously