Many people in the Chess.com UK Tournament fly the Union Flag not the Union Jack (only when it is flown on a boat is it the Union Jack :P)
And another fact is that the flag should be flown with the larger white section going clockwise and the smaller white section anticlockwise. The opposite way round is a sign of distress.
For sure Ireland is not one of them no more. This is fact. But you may notice if an Irish person does well in any sport England will try and claim him.

And to think these are the people that managed to hold together a global empire.