Gregg Wallace visits the Denby factory in Derbyshire, which has been making pottery since 1809. We Brits drink a staggering 195 million mugs of tea and coffee every day, so Gregg is following production of one of the factory’s best sellers, the Halo Heritage mug.

Every cup and pot in this historic factory starts life as a giant 100 metre-long mound of clay. Operations director Dean Barlow explains there are 100,000 tons of clay in this enormous pile, enough to last the factory about 20 years. Show less