I don’t.
But….
They are saftey (not speed) cameras, or so we are frequently told. They are not purely for generating revenue, they are for highlighting sections of road that are particularly dangerous, and encouraging you to drive at a safe speed on them.
As a layperson (who has no chip on shoulder about speeding, never flashed other cars about speed cameras, and never had any points on licence in 15 years, I hasten to add) I am suprised that there is not already a test case that argues that flashing oncoming drivers is also just encouraging them to drive at a safe speed on that road. It’s not about diddling the police out of money after all, because they are doing it for the safety aspect not the generation of revenue. It’s not about encouraging people to drive dangerously because they will remember the spot and drive at a safe speed every time they pass it whether they are flashed by another motorist and slow down, or whether they are caughet by the police and have a fine/points/insurance premium hike.
Whether or not you get caught for speeding the first time you do, you will always be mindful of your speed once you know it’s a spot for mobile cameras, surely?