The sculptor Sir Antony Gormley, renowned for his Angel of the North and his iron men installations, such as Another Place, has now curated an exhibition of art by prisoners. They are detainees in the UK’s prisons, secure hospitals, immigration removal centres, as well as ex-offenders now back in the community. He was inspired to put on the show at London’s Southbank Centre because, he said, of his own spell behind bars.