This report from May 2016 forms part of a series in which the BBC was given exclusive access inside Wandsworth Prison. On Wednesday 1 March 2017, it won in the Home News category of Royal Television Society news awards.

The first report by correspondent Ed Thomas, cameraman Tony Dolce and producer Noel Titheradge, revealed drug abuse, violence, corruption and overcrowding.

They examine the state of mental health, with rates of self-harming and suicide increasing by a quarter on last year.

Some may find this video distressing