"Including the British Isles" doesn't have to mean "all of the British Isles", it can be parsed equally as "Including the ones in the British Isles. For exampl

"Including the British Isles" doesn't have to mean "all of the British Isles", it can be parsed equally as "Including the ones in the British Isles. For example, "Including the European countries, I have been to 20 countries" does not mean I have been to every European country.