I am very worried about my dad's health

Michael Biggs

A hospital spokesman said Biggs's condition on Monday morning was "comfortable and stable at the moment".

"We don't know how long he'll be in hospital, it will be reviewed on a day to day basis," he said.

"There are no plans for discharge at the moment."

More medical tests will be carried out on the robber on Monday.

Michael, 26, said: "I am very worried about my dad's health, this is the fourth time in less than six months he has had to be rushed to hospital."

Poor health

The robber flew back to Britain from Brazil in May after spending 35 years on the run and was sent straight back to jail to complete a 30-year jail term.

He had been in poor health for some time, suffering two strokes and a minor heart attack, and that was one of the reasons cited for his return.

Michael added: "My father has been an honest man for over 35 years.

"He is one of the kindest people you could meet yet he is still locked up in Britain's highest security prison.

"His health is getting worse and his condition is clearly deteriorating.

Internal bleeding

"Keeping him there seems crazy, particularly when the money used to do so could surely be better allocated elsewhere."

A family spokesman said Michael was "very upset" about his father's latest bout of ill health.

Biggs was treated for internal bleeding at the same hospital in September and had an emergency blood transfusion in August.

He also spent nearly a week at the Queen Elizabeth in June after suffering another suspected stroke.