End is near for world's largest iceberg as it sets sail on swan song journey

Behemoth twice the size of Greater London, named A23a, has broken free after three decades

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United Kingdom ,Antarctica ,Greater London ,United Kingdom General ,British ,Andrew Meijers ,Ian Strachan ,David Attenborough ,Andrew Fleming ,British Antarctic ,Southern Ocean ,Elephant Island ,South Orkney Islands ,British Antarctic Survey ,South Georgia ,