By Sam Truelove Police have launched a murder investigation after a man was stabbed to death inside a flat in London. The 66-year-old victim was knifed inside a flat in Lockhart Close, Enfield at just before 7:30pm on Friday. Police officers and paramedics were called and the man was found in the communal area of the block. He was pronounced dead at the scene. The Metropolitan Police are investigating the fatal stabbing. No arrests have been made. A spokesperson for the force said: “Detectives believe they know the identity of the man. Enquiries are under way to identify and inform his next of…