HMP Wandsworth previously hit national news last September following the escape of terror suspect Daniel Khalife.

Ian Acheson, a former prison governor, told the MailOnline: “If this footage is authentic and I’ve been assured it is, the problems confronting a likely new Labour administration go far beyond overcrowding.

“This is a national law enforcement agency. The idea that recruits to it would even contemplate, let alone participate in, sex acts is a stunning indictment of the utter chaos inside this prison. It won’t be an isolated incident.

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“The state is no longer in charge here. The security implications and corruption threat is obvious and as explicit as the flagrant acts. The widespread infiltration of illicit mobile phones will mean that this footage is seen by huge numbers of prisoners.”