Are speed cameras snapping aircraft?

We’ve remarked before how councils justify their phalanxes of cctv cameras by claiming they are for crime-busting while, in reality, they are mainly used for extorting money from hapless motorists.
In their desperation to squeeze cash from us, councils become ever more wily. But we were still puzzled to see this speed camera in the borough of Richmond in south-west London. For it is pointing not at the road, but into the air, at an angle of something like 30 degrees above the horizontal.
As we stared at it, we realised that it was pointing directly at the flight path of jets coming into Heathrow along the Thames. Surely they couldn’t seriously be trying to find a way to fine aircraft for speeding. Or perhaps it’s there to try to catch Santa.