"I'm in the depths of the vast BBC archive, a collection of 12 million artefacts including 600,000 hours of television content and 350,000 hours of radio.

With its endless shelves of Beta tapes, VHS and DVDs and row upon row of canned film stored together like weights in a gymnasium, this former greetings card factory in an industrial estate near London's Heathrow Airport, is but one of 25 buildings across Britain that house this extraordinary resource. At Caversham in Berkshire there are more than six miles of BBC documents; the contracts, correspondence and expenses claims behind eight decades of broadcasting."

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