Don't I know it. Turns out that a new neighbour of mine is very anti-motorbike and has complained time and again to me about the 'excessive noise, which must be illegal" of my BSA. He's even tried to get other neighbours to side with him, with no success so far. It's no coincidence that the last time I rode it, the police were waiting in the next road to stop me and check that I and it were road legal because they had had a report of "anti-social, possibly illegal biking". They found nothing untoward. I only ride it in daylight hours so why can't he live and let live?