Antiques Roadshow: Castle Howard 1

The programme embarks on its 40th anniversary tour by paying a visit to the stately home of Castle Howard, near York. Book specialist Clive Farahar is stunned to read a letter in which Darwin admits to making a mistake in The Origin of Species, a diamond brooch draws gasps of delight as the owner is advised of the value, while art specialist Philip Mould ferrets out what could be a lost work by Renoir. Host Fiona Bruce is joined by the programmes first presenter, Bruce Parker, who helps to assess the secret of the Roadshow's success