A TWO-TIMING dog fox living on a landfill site near the mouth of the Thames becomes the unlikely protagonist of Foxy Business. This documentary follows the soap opera style of one particular canine family - the Dunlops. The film, which took three years to make, was only possible because the production team found a group of foxes that had no fear of man and behaved naturally, day and night. They were protected from disturbance because they lived in one of the safest environments for foxes in Britain - a landfill site. "Even scientists have been astounded by what we filmed," says producer, Mark Jacobs. The Dunlop foxes got their name because in previous years they had regularly made their home inside a pile of tyres. For the crew to film the Dunlops and their cubs, they had to join them inside the tyres. They managed to do this by building a special fox den, with a filming porthole under the tyres.