By Martin Bagot Families were last night urged to get whooping cough jabs if not already protected after the deaths of five babies from the disease sparked fears of further tragedies. Experts are warning we could be facing the biggest outbreak in 40 years unless action is urgently taken. Parents were also told to look out for symptoms in children, including a runny nose, sore throat and a “whooping” noise when coughing and seek urgent medical help. The UK Health Security Agency reported 1,319 cases in England during March, which was up from 918 in February and 556 in January. There were just 8…