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Pictured: Conservation Cleaning Supervisor at Longleat, Tracie Mason cleans Items from a Regency travelling sewing-box given by HRH Princess Sophia, fifth
daughter of George III and Queen Charlotte, to Lady Isabella Thynne, eldest daughter of the 1st Marquess and Marchioness of Bath.

Expert conservation cleaners are embarking on their painstaking annual spring clean of one of Britain's finest Elizabethan stately homes.

Longleat House in Wiltshire has 128 rooms containing thousands of historic objects which require careful cleaning using low-suction vacuum cleaners and fine dry brushes.

There are also seven libraries with over 40,000 books which need dusting and repairing.