London's Silver Vaults

What is a silver neff? What on earth is it for? And - most importantly - how much is it worth?

Justin Rowlatt finds out as he explores a subterranean bazaar of silverware located deep beneath the streets of London's legal district.

There to show Justin around was antiques dealer Joel Langford.

This video is brought to you by the team behind the Elements radio podcast series on BBC World Service.