Most police cars in the UK don't have built-in speed cameras. Instead, police use various methods to enforce speed limits, including ¹:
Fixed Speed Cameras: Stationary cameras installed at specific locations
Mobile Speed Cameras: Vans or cars with radar or laser technology to detect speeding vehicles
Handheld Devices: Officers use portable devices to measure speed
ANPR Technology:... https://trafficcameras.info/do-police-cars-have-speed-cameras/