By Adam Brimelow Health Correspondent, BBC News
17 November 2014 Last updated at 01:21

Mediterranean diets may help reduce the risk of heart attacks, researchers say
A Mediterranean diet may be a better way of tackling obesity than calorie counting, leading doctors have said.
Writing in the Postgraduate Medical Journal (PMJ), the doctors said a Mediterranean diet quickly reduced the risk of heart attacks and strokes.
And they said it may be better than low-fat diets for sustained weight loss.
Official NHS advice is to monitor calorie intake to maintain a healthy weight.
Last month NHS leaders stressed the need for urgent action to tackle obesity and the health problems that often go with it.
The PMJ editorial argues a focus on food intake is the best approach, but it warns crash dieting is harmful.
http://www.bbc.co.uk/news/health-29929403