Probably Ireland the only exception and that was a one off event as far as I am aware the borders of Wales Scotland and England are fairly static and have been for many centuries if not thousands of years whereas in Europe they change in living memory. There is a bar on the border of I think Belgium and Holland and the border goes right through the bar and the bar has different licensing laws so you order a drink the barman says sorry last orders have gone but if you step a yard to the right I can serve you for another two hours because you are in a different country. This is because the border has been redrafted many times often within recent generations. If you remember just after the referendum result Scotland declared they wanted to seperate from Britain and join the EU the EU rejected this why ? Because they did not want to encourage break up in Europe which is a big danger for them
I think you will find that both Scotland and Wales have at various times in their history fought for their independence from England.
Britain has also faced armed resistance from countries striving to claim their independence throughout your history. Those countries include USA, South Africa and Ireland. Britain has caused plenty of conflict around the globe.
