An average of 25,000 tonnes of fish and fish products are traded each year at Billingsgate Watch: A day at the market Watch: Fish training school

Until 1699 it was a general market, selling everything from corn to coal, but for the past 300 years has only dealt in fish.

The market occupied a site in the heart of the City of London, not far from the Tower.

The original building, now surrounded by the offices of the City's burgeoning financial services sector, was abandoned in 1982.

Billingsgate's current home is a purpose-built complex a couple of miles to the east in London's Docklands.

Working Lunch woke Rachel in the middle of the night and sent her to find out about the business of selling fish.

Watch how her day went by following the link below the picture.

In her second film she reports on how Billingsgate is preparing for the future by training a new generation of fishmongers.