'They're wild animals, all they want to do is fight. We can't cope': The brutal gang nightmare that has engulfed HMP Wandsworth - as insiders reveal the appalling truth behind spate of accidental inmate releases

There can be few more forbidding prisons in the country than HMP Wandsworth. The Victorian jail, with its double-fronted wooden entrance beneath a gothic arch, is flanked by twin three-storey towers