Missing islands:

Many of these are probably not notable. Those with question marks are those that don't show up with the location when searched for at Geograph or are otherwise questionable.

Scotland

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Not actually islands

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Island groups

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England

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Island groups

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Wales

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Island groups

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Commons

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  • Birnbeck Island
  • Calbha Mor
  • Eileanan Iasgaich
  • Lingay, ?