A father from Cambridge has helped launch a clinical trial into a drug which could prevent both his sons developing a serious genetic illness they are carrying.
Black Bone disease progresses during adulthood, and causes brittle bones and heart disease. Dr Nick Sireau gave up work four years ago to concentrate on finding a drug to stop its progress.
Click below to watch Matthew Hudson's report.
More top news
Mild, windy and mainly dry.
It's not Father Christmas' usual mode of transport but these young patients didn't seem to notice.
Mild, generally dry and breezy.