Maybe I am a little bit simple in this point, but can`t you mobilise your Royals? I would imagine since you still have a monarchy their word would weigh a lot although they don't have to do more than to sign new laws. Hell, if our Bundespraesident held a speech and told our Gouvernment "are you completely run out of good sense or what?" everyone would duck, expecially because normally he doesn´t and it is even considered bad manners if he made a point about daily policy.
But as far I can see this is not a matter of daily bureaucracy. This is a matter of national culture. To forbid a nation to sing is to forbid a nation to be themselves, it is to supress freedom not with bajonets but with paragraphs. Something very, very big seems to run the wrong way on your island, and I guess bureaucracy takes over the reins of gouvernment.
So my advice is: collect signatures in the pubs and on the streets, write a petition to Her Royal Highness and beg for a word of sense against your bureaucrats´stupidity.
And make sure the SUN is informed, that should be your best weapon. *GGG*