They also said there was no evidence of healthcare needs assessment of the prison population, no linking of healthcare provision in the prison to the Island's health service and, in some cases, unsafe prescribing practice.

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Dave Galligan, Unison Cymru's head of health, said the overnight cover was an "unsafe, unhealthy working practice".

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Some opponents have said the practice may be unsafe.

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There are fundamental differences between the aviation industry and the practice of medicine that make it unsafe to draw too close an analogy between the two.

BBC: What we can learn from fatal mistakes in surgery

His practice was illegal, unethical and unsafe.

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