A pensioner died during heart surgery at an NHS hospital after the operating theatre she was in suffered a ten-minute-long power cut, an inquest heard.

Jean Dye, 77, was at the crucial stage of the procedure when the electricity went down - meaning doctors had to delay the process as they couldn’t see vital X rays.

Five years after her death, a coroner has now issued a report saying that the delay in restoring power was a ‘critical factor in her death’.

It was found that an engineer was required to reset the system because it was in another part of the hospital.

In a Prevention of Future Deaths Report, Paul Smith, Senior Coroner for Greater Lincolnshire, has now raised concerns about the lack of power controls within the operating theatre and that medical professionals weren’t trained in how to understand when electricity has been restored.