By City A.M. Reporter The Metropolitan Police are investigating the alleged theft of a Banksy installation in south-east London. The piece of street art – a traffic stop sign covered with three aircraft resembling military drones – was revealed at the intersection of Southampton Way and Commercial Way in Peckham at midday on Friday. Less than an hour after Banksy confirmed it was genuine by posting a photo of it on social media, witnesses saw the artwork being removed by a man with bolt cutters. The force said it has received a report of theft and the “incident is currently being investigated …