Obviously the English Channel separates the continental mainland and the UK. Geographically the UK is part of the British and Irish Isles. The UK is generally not considered as part of "continental Europe", but some definitions of Europe also include the UK geographically. It is debatable but I draw a line where the Atlantic Ocean clearly separates it from the mainland.
UK is an island, not part of the continent.
Which of the 7 geographical continents do you consider it to be part of then?
Obviously the English Channel separates the continental mainland and the UK. Geographically the UK is part of the British and Irish Isles. The UK is generally not considered as part of "continental Europe", but some definitions of Europe also include the UK geographically. It is debatable but I draw a line where the Atlantic Ocean clearly separates it from the mainland.
Gibraltar...
... is not part of the UK itself. But it is under British sovereignty.