People who are English won't care
Welsh will care and think you're an idiot
Scots will really care, and think you an idiot
Roughly 50% of people in Northern Ireland willreally, really care and think you're either an idiot orbeing deliberately provocative
So it's not a great strategy. Use “British” if you have to use only one word. For NorthernIreland, I'd always say “Northern Irish” though this has the potential to annoy someunionists/loyalists. Better to take that risk than to say “British” to nationalists/republicansthough.
I am British, and born in England. If people call me English and referring to me as being bornin England, but if they are referring to my nationality, it annoys me. I am British, and haveBritish citizenship. The Queen is the Queen of the United Kingdom, but can, informally, becalled the British Queen. People who call her the Queen of England are uneducated, as there hasnot been an English Queen since the Act of Union in 1707.
The problem stems from a lack of understanding between the differences of the UnitedKingdom, Great Britain, England, Scotland, Wales, and Northern Ireland. It doesn’t help thatwe have four separate teams in both Football and Rugby. People aren’t taught the difference atschool abroad and maybe they should be.
Depends which of the four countries they're from. If you refer to an English person as beingfrom England, then no. However, if they're from Scotland, Wales or Northern Ireland, they willbe most definitely annoyed. The name UK is more of a political umbrella term that covers allfour countries, but the individual country names represent history and culture. Any citizen canbe referred to as from the UK, but to be honest they'd probably prefer being referred to as fromEngland, Scotland, Wales or N. Ireland. If they have an obvious recognisable accent, use one ofthe four to describe them. If they don't, stay safe and say U.K. or British. They'll probably tellyou where they're from, and then you say English, Scottish, Welsh or N. Irish. But never referto someone who is definitely from Scotland, Wales or N. Ireland as from England, cause you'llcome across as ignorant and offend them.