A prison governor has suffered a fractured skull after having his head bashed in by an inmate at HMP Ranby in Retford, Nottinghamshire. Loading audio...

The governor is thought to have been attending a celebratory event held on one of the prison's wings on May 16.

He remains in hospital, where he is still recovering nearly three weeks after the incident.

It marks in the latest in a string of assaults on a prison official as the country grapples with an overcrowding crisis in Britain's jails.

The attacks have prompted calls from the prisons union for the Government to consider US "supermax-style” jails for the country's most violent and dangerous criminals.

In the US, Supermax prisons see inmates spend most of the day confined to single cells with facilities made of poured, reinforced

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