A friend of mine went to court a few days ago to challenge a speeding fine.
He didn’t address the question of whether he had been speeding or not. Rather, he noted that the speed camera which snapped him passing was illegally parked, in an emergency stopping only zone. Police are required to comply with the laws they enforce. This means the speed camera was illegally parked. The evidence obtained by the camera was obtained illegally, and therefore cannot be used in court.
It is not a silly argument. Judgement was reserved. I will let you know the result.