Haulage Permits and Trailer Registration Bill [HL]

Since we are in declaring-interest mode, I, too, used to have a trailer a few years ago. It is the point about the brakes that interests me, because it seemed to have an automatic brake on the driveshaft when it connected to the car, so when the car was accelerating or driving normally the trailer was dragged, but when one put on the car brakes, the momentum of the trailer pushed forward on a hydraulic ram that automatically activated the rear brake. I have no idea what it was called, and I am sorry that I cannot describe the technology more accurately, but many trailers have these automatic brakes that come on when the vehicle brakes.