same happened to me. was on a highway intersection and the speed limits were changing and my fault was to keep the higher limit of 110kph (i think) when it flashed and suddenly went down to 80 and then back up to 120 all within 800 meters. i could say its unfair, but its my fault, should've known better.
anyway, not sure if the camera flashed at my car or the one behind us, we were both going the same speed. still waiting for the ticket to come.
just wondering because: it was a rental, from France, and i live in London. was driving on an international license and don't have a UK license. does the same rules still apply as here? How do speeding fines work in Switzerland?