Andrew Mountbatten-Windsor was photographed driving near his home on the Sandringham estate on 4 June, a rare public sighting that has sharpened scrutiny of King Charles' embattled younger brother as police inquiries and financial questions swirl around him. The 66-year-old former Duke of York was seen close to Marsh Farm, where he now lives, with a distinct purple mark running from his right temple down towards his cheek. Andrew has largely van…