Under the cover of darkness, Claude slips through the back door of an unknown home and enters the kitchen. As its unsuspecting owners sleep inside, the intruder pads over the terracotta flagstones with barely a sound. He knows what he is looking for and he knows how to get it. He’s done this before. But it isn’t jewellery or electronics that Claude’s after – it’s food. Scroll down for video Lilly the cat at the BBC's feline HQ in Shamley Green, Surrey. Lilly is one of the stars of BBC's Horizon documentary, The Secret Life of the Cat. The makers of the show fitted 50 cats with highly sensitive GPS collars and miniature 'cat cams' that recorded their every move When the cat's away: The BBC Two show followed 50 cats like Thomas, pictured, around the leafy Surrey village of Shamley Green during one week in April Because Claude isn’t just any old burglar. He’s a cat burglar – quite literally. An eight-year-old grey and white tom, he likes chasing mice, sitti