After six months, the non-diet group had lost an average of 1% of their weight, the calorie restriction group, 10.4%, those who were on a calorie restricted diet plus exercise, 10% and the very low-calorie diet, 13.9%.

BBC: NEWS | Health | Low-cal diet 'long-life benefits'

However, Mr Walsh said that "the new transport secretary has made it clear that she wants this issue addressed and has set up a smaller working group with immediate effect to see how quickly this restriction can be revised".

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News Group Newspapers pleaded guilty to one count of "reporting matters in contravention of a reporting restriction" contrary to Section 52A of the Crime and Disorder Act 1998.

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