There has been a significant rise in the number of cases of children ingesting the liquid in e-cigarettes, prompting poison experts at Public Health England to warn parents to keep them out of reach.

Last year the National Poisons Information Service (NPIS) received more calls related to exposure to e-cigarette fluid than in the six years previously, its 2013/2014 annual report says.

Of the 204 calls about e-cigarettes in 2013, almost half related to children and young people, and 22% concerned children aged under five years. In the vast majority of cases, the liquid had been ingested.