Plot: Antiques Roadshow is at Forty Hall in Enfield, north London, where treasures include a pair of miniature hands crafted by the artist Lucien Freud, a model of Donald Campbell’s Bluebird which broke the land-speed record in 1964, and a destination board from the front of an early London bus. Plus a rare set of wedding jewellery from Nepal and a diamond cross and gold necklace with a hefty price tag