Pedantic, but the Hebrides are not part of Great Britain (when talking strictly about it as an island). Also it looks like some non-answer islands have disappeared and others are just gray.
I have some issues with this map and I am hoping to replace it sometime in the future. The new map will solve the problems you've mentioned, thank you for your feedback!
Not all the islands are included. People tend to think about the Åland islands as one thing, but the main island Fasta Åland seemed a little more obscure.