Brits?
Where you from OP? Shocking terminology for this question.
I am English. England is first choice. However wish Wales, Northern Ireland and Republic well.
My Dad is from Northern Ireland, and like me is BRITISH. He has been in England 60 years, thanks to the RAF. Yea he wants Northern Ireland to do well, England and Wales. He always supports Republic of Ireland.
It is a shame that in other team sports, Rugby Union, Rugby League, Cricket and Hockey (Field and Ice), I read of one Ireland team.
Yet football is still divided. I know it would mean calls for an all Ireland League, and football attracts idiots who in recent years have have caused trouble at cross border club games. But I am a dreamer still, and hope we see an all Ireland team in my life time (am 47 so time is pressing).