There has been a similar discussion on another music forum I take part in. I wrote there, and repeat here, as a modest proposal:

Is there any way forward? Maybe there needs to be the equivalent of mass trespasses, where the "law" is constantly and regularly defied, shown up for its idiocy, and made unworkable and unenforceable. Remember the other "law" that Labour passed preventing any kind of political protest within a mile radius of Parliament unless licensed (and agreed by the police) in advance? Through the publicised activities of Mark Thomas and others, the bureaucratic process broke down under the swamp of applications, and the restrictions were lessened, then ignored, then dropped.

There is going to have to be mass action of some kind. Maybe we should start turning up to public places with our weapons hidden and small enough to avoid detection: kazoos, mouth organs, ocarinas, wooden recorders, jews harps, drum sticks, shakers, rattles.... Let's turn our instruments into arms, and make the walls of the city shake!