By Mikey Smith Health visitors should be allowed to administer vaccine jabs to children at home to combat an “alarming” spike in measles cases, Labour has said. It comes as a health expert blamed vaccine hesitancy and a lack of health visitors for the growing wave of outbreaks. The UK Health Security Agency declared a “national incident” warning too few youngsters were protected against the potentially deadly virus. Jenny Harries, the agency’s chief executive, urged parents to check whether their children had had the measles, mumps and rubella (MMR) jab. She said the UK was on a ‘trajectory fo…