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“Tonight I was a little dumbfounded,” said Roberts.

But in January last year, the 31-year-old said doctors were "dumbfounded" to find out he had heart failure after some blood tests - with many GPs not specialists in steroid use.

The voice on the other end seemed dumbfounded.

"I'm dumbfounded and speechless. I thought I was doing them a favour," he told the Dorset Echo.

Mr Brilliant, who has returned to the US, says he was “dumbfounded” when he first heard the BBC investigation.