SKY NEWS: NHS medicine errors may have contributed to 22,000 deaths a year

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Study author Rachel Elliott, a professor of health economics at the University of Manchester, said: "In a perfect system there would be no errors. But there are no systems, particularly those involving humans, where there are no errors.

"As far as we're concerned this information is actually very useful. I would say people shouldn't be worried, most prescribers, and pharmacists and nurses are aware of the risks associated with medicines and are very vigilant at all stages.

"Unfortunately, systems are not perfect and therefore errors do occur. Most of the errors we've picked up in this 237 million are not going to affect the patient - are not going to even reach the patient."