Serious question here. Are not Wales, Scotland and England all one in the same?
Same passport?
Same currancy?
Same gov't?
Same Queen?
The above (and Northern Ireland, even though I wish we got rid of them) are all part of the UK, one single state.
However, because of historical reasons - largely religious/ linguistic/ regal - NI, Wales and Scotland enjoy some degree of autonomy, especially at sport. England gets none besides sport, quite frankly because for many England
is the UK - Wales is part of the English crown; and while the Act of Union with Scotland in 1707 joined the two kingdoms together, England has always been wealthier, more powerful and more populous.
The British Isles are quite unique in the world when it comes to nationality, because there are literally so many different people claiming different things; you have places like the Channel Islands with different tax laws; Isle of Man with its own parliament; Scotland with its own banknotes; further afield places like Bermuda and Montserrat which are hangovers of empire; Eire which is a completely different country in itself; Northern Ireland which is just a ****ing mess.
In the end, excluding Northern Ireland, it's stable enough that people can claim several identities and things work out. For example, on the recent census under nationality, I called myself a Londoner, English and British. All three are true and all three work.