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If you've been to see one of the summer blockbusters at the cinema recently, chances are you would have spotted a costume supplied by Angels Costumes.
Based in Hendon, north-west London, this family business houses the largest privately owned collection in the world.
Now they are taking stock and undertaking a mammoth task.
BBC London's Claudia Redmond went to visit the piece of Hollywood in Hendon.
Filmed and edited by Claudia Redmond