Knebworth House

The items featured in this edition include a diamond brooch which almost went to a car boot sale for £1, a marine chronometer left to the owner by a drinking pal, a bronze Spirit of Ecstasy which, if genuine, could be worth £10,000, and a satsuma pot which David Battie says, 'is as good a piece as I've ever seen on the Roadshow.' Michael Aspel and the experts gather for an al fresco day in the gardens of Knebworth House in Hertfordshire.