To me this type of question always raises the ugly head of republican against monarchist or National Independance against United Kingdom.
We are practically all living alongside friends, family, workmates who make up the 4 countries of Great Britain. It is the saddest thought to me this joyous part of our heritage is about to change and I fear not for the best, I will be happy to be proved wrong.
As for the question at hand I ask this. 'Why would you play for team Great Britain if you obviously feel there should be no such thing?'
You are being nothing short of a hypocrite and should have the courage of your conviction and state clearly you will only play for your independant country whether that be Northern Ireland, Scotland, Wales or England. Easy really, do not play as a member of team G.B. if you do not accept the Queen as the Head of State for Great Britain .