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Included in the July 18 sale at West Norwood was a collection of photographs of scenes from the 1966 BBC Dr Who series The Power of the Daleks, all official tapes and recordings of which have been lost or destroyed.

The colour negatives, photographs and short monochrome film strips had been kept by the late Derek Dodd who designed the Dr Who sets as well as other TV classics. They showed cast members such as Patrick Troughton and Pamela Anne Davey along with a prominent role for the Daleks. Estimated at £800-1200, the collection sold at £5200.

Cassolettes at £15,000

From two centuries earlier, the prize of the day was a pair of c.1770 George III ormolu and blue-john cassolettes.

The 8½in (22cm) tall vases with goat’s masks holding laurel swags, were attributed to Matthew Boulton having been derived from a sketch in Boulton and Fothergill’s pattern books.

The Roseberys examples would probably originally have had medallions suspended from the rim and they had some minor condition problems including an inch-long (2cm) section missing from one of the laurel swags, some restoration and rebuilding to the blue john and some rubbing to the ormolu.

Nevertheless, blue john is as much in demand today as it was in the 18th century and, against a £6000-10,000 estimate, the cassolettes sold at £15,000.