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Ms Bingham added the report raised concerns about drug access at Parc Prison and called for an updated strategy to address both illegal and misused prescribed drugs.

"Had he done so, he might have noticed that Mr Petryszyn was in need of medical assistance," Ms Bingham added.

Kimberley Bingham, the acting prisons and probation ombudsman, said there was intelligence that Mr Petryszyn was supplying psychoactive substances in prison, but there was "little evidence" to suggest that he was using them himself.

He was thrashed 10-3 at the Tour Championship by Ding Junhui in March and suffered losses to Stuart Bingham and Akani Songsermsawad at the World Grand Prix and World Open.

Australian Neil Robertson will play Mark Selby in the last eight after coming from behind to win 6-4 against Stuart Bingham - the man Robertson beat 10-0 in the recent World Grand Prix final.