Is it acceptable for a Political leader to shun the National Anthem?

[generic-user-1]

this is getting more and more fun every day, corbyn says something good about the ira and the military is talking about a coup d´etat...

http://www.independent.co.uk/news/uk/politics/british-army-could-stage-mutiny-under-corbyn-says-senior-serving-general-10509742.html

 

im getting confused with the english...  now they say Cameron had sex with a dead pig(and i dont thing they mean thatcher)