Two of the country's largest wholesale markets are on the brink of closure. The City of London Corporation has decided to shut the historic meat market at Smithfield and the fish market at Billingsgate, bringing to an end centuries of food history. Sheila Dillon is given a tour of Smithfield market by the historian Matthew Green who describes how Smithfield features in the work of Charles Dickens and was once described as the "kitchen of the universe" by the writer Ned Ward in 1702.

The programme hears from the Smithfield traders who work through the night butchering and selling meat to restaurants and shops across London, the South East of England and beyond.

There has been considerable opposition to the closure of the markets. More than 37,000 people have signed a petition asking the City of London Corporation to keep the markets where they are including Alicia Weston who we meet at Ridley Road street market in East London. Here fishmongers are concerned about where they will source their supplies if Billingsgate closes. The City of London Corporation chairman Chris Hayward responds.

Finally, the author of Hungry City Carolyn Steel and Professor Tim Lang from City University reflect on the importance of wholesale markets in strengthening food supply chains as well as their contribution to the social and cultural fabric of a place.

Presented by Sheila Dillon Produced for BBC Audio in Bristol by Robin Markwell