In the western nave of Westminster Abbey, nestled between illustrious tombs and beneath a slab of black Belgian marble, lies the body of an unidentified soldier of the First World War. He is remembered as the Unknown Warrior, a symbol of the half a million Commonwealth servicemen who went missing between 1914 and 1918, their earthly remains lost to the chaos of conflict.

As Remembrance Day approaches and guided by John Nichol, former RAF navigator and author of 'The Unknown Warrior', we journey from the horrors of the Western Front to Westminster Abbey. He explains the profound importance this monument held for the many millions suffering from collective grief after the incomprehensible losses of World War One.

Produced by James Hickmann and edited by Dougal Patmore.

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