Hollywood star Damian Lewis on Sunday drove sheep across a bridge crossing London’s River Thames in a celebration of a medieval tradition. The Golden Globe and Emmy Award-winning British actor wore his grandfather’s wool coat and wielded a crook to move the sheep across Southwark Bridge. The event honours the medieval tradition of anyone awarded “freeman of the City of London” status being allowed to drive their sheep toll-free across the bridge, a historic trading route. An event celebrating the tradition has taken place annually since 2013. Lewis, 53, described the event as “eccentric”, addi…