Behind the scenes at museum storage in London

It is a treasure trove of millions of objects. There are 4,000-year-old pots, paintings by the masters, iron lungs, microscopes, ancient Chinese robes and modern-day ball gowns.

Blythe House in central London stores artefacts from the Victoria and Albert, the British, and the Science Museums, and now the huge collection is set to move to a new state-of-the-art facility.

Before it goes, the BBC's arts editor Will Gompertz had an exclusive tour.