Page last updated at 06:53 GMT, Tuesday, 13 April 2010 07:53 UK

Doctor Who secrets published by BBC Archive

Patrick Troughton, Jon Pertwee, Tom Baker. Colin Baker and Sylvester McCoy

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Fans of Doctor Who can now pore over some of the secrets from the programme's past, with their online publication by the BBC Archive.

The information revealed includes how the first regeneration was planned, and some of the actors who turned down the keys to the Tardis.

Lizo Mzimba reports.

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