Perhaps you could have a clearer definition of "British" in the description?
Technically Belfast, Isle of Man, Gibraltar, Falklands are not part of Great Britain. They could be described as "British" since they are all possessions of the crown however.
I see your point, but I think it is pretty clear already. These places are all ‘British’ in common parlance. The Falklands, Gibraltar etc. are ‘British’ Overseas Territories, and I think most people would accept Belfast being described as British as well as Northern Irish or Irish. While ‘British’ can have the narrower meaning of ‘on the island of Great Britain’, that isn’t its only meaning.
Perhaps you could have a clearer definition of "British" in the description?
Technically Belfast, Isle of Man, Gibraltar, Falklands are not part of Great Britain. They could be described as "British" since they are all possessions of the crown however.