As PnL pointed out I’m from the UK/Britain, that little sticky out bit called Wales to be more exact haha :)
I don’t think ‘Britain’ or ‘UK’ include Ireland, Great Britain is just Wales/England/Scotland, UK is Great Britain and Northern Ireland and the British Isles includes it all. Don’t quote me on this, there is a Wikipedia article on it somewhere.
Also I didn’t realise there were so few of us Brits :(