'I'm in the wrong job,' I said to our practice nurse, 'I should definitely have been a detective.'

For BBC Breakfast's Dr Rosemary Leonard, a day in her GP's surgery is full of unexplained ailments and mysteries to be solved.

From questions of paternity to apparently drug-resistant symptoms, these mysteries can sometimes take a while to get to the bottom of, especially when they are of a more intimate nature.

In her second book about life in her London surgery, Dr Rosemary recalls some of her most puzzling cases... and their rather surprising explanations.