HMS Belfast will remain shut over Christmas while officials investigate the collapse of the gangway that left two workmen injured and caused panic among visitors on board. Managers said the attraction, visited by up to 1,800 a day, would lose thousands of pounds as the health and safety executive carries out an inquiry. More than 100 people were evacuated yesterday, including 30 children due to spend the night on board. Electrician Nanji Hirani said: “Everyone was screaming and running away and the bridge just went down, straight down, flat