A woman has been arrested over a social media video allegedly showing a member of prison staff having sex with an inmate in a jail cell.

The Metropolitan Police said it began an investigation on Friday “after officers were made aware of a video allegedly filmed inside HMP Wandsworth”.

It added a woman was arrested on suspicion of misconduct in public office the same day and is in police custody.

The Met said its inquiries continue and it remains “in close contact with the Ministry of Justice”.

HM Prison Service previously said it had reported the former officer to police over the allegation.

It follows an “urgent notification” about conditions at HMP Wandsworth in May, issued by chief inspector of prisons Charlie Taylor.

Inspectors found Wandsworth was stricken with severe overcrowding, vermin and rising violence among inmates.

HM Inspectorate of Prisons declined to comment due to the pre-election period.

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