If only it was the musician who would be subject to arrest/fine... it would be so much easier to make a stand and show how ridiculous this policy is. There are a bunch of us here in Sheffield who would have already staged a "sing-in" type event by now, I'm sure -- I'd certainly be prepared to go to jail myself; it would be worth it for the media attention it would doubtless attract. But of course, it's one thing to do that if you suffer the consequences yourself -- and a far different matter if your actions cause a third party to be fined and/or arrested.