Help needed lads - passport

sorry not footy topic but in need of help

in the question 'country of birth'
do i put united kingdom or wales?
or does it not matter?

cheers in advance

I just ordered a new 1, I put Wales. 160 bucks!

Put United Kingdom, or it will get rejected and returned

cheers boys, ive gone with united kingdom
i guess that cant fail

United Kingdom is what to put down, the passport is confirming you are a citizen of the United Kingdom