think it’s pretty clear that due to budgetary constraints enforcement is lacking in all areas

It is and it isn't. I've noticed a hell of a lot more police on the roads over the last year or so. Speed traps come and go, but often those aren't run by police but private contractors - it's less about budget constraints and more about profitability. Like I say, there's a higher risk that someone will get off a 20 speeding charge, in which case they not only miss the revenue but also incur court costs.

Cheers for the information though, it's nice to hear updates in their practices, and how it varies across the country. Like, in a couple places I've seen some really deceptive looking cameras - not in a van but on tripods. There's definitely an element of trying to catch people out, while more or less skirting within the bounds of the law.