"Whatton's a great leveller," says Lynn Saunders, governor of HMP Whatton, the largest prison for adult male sex offenders not just in the UK, but in Europe.

"We've got everybody here you could imagine," she adds, "vicars, teachers, airline pilots, police officers, prison officers, doctors… people with learning disabilities, who have low IQ and complex mental health problems."

Built in Nottinghamshire in the 1960s, Whatton has a capacity of 841 inmates of all ages. Around 70% of them have committed offences against children, the rest against adults. The prison's nickname locally is "the Paedo Palace".

Approximately half of the prisoners are on determinate sentences so they know their release date, the rest do not. Whatton is a specialist treatment centre for rehabilitation, offering a wide range of sex offender treatment programmes, more than any other prison in the UK.

The overwhelming majority of Whatton's inmates have accepted their crimes and are working to address them and the range of offences they have been convicted for varies considerably. They include contact offences - touching, penetrative sex, incest, sexually related violence or even murder. Then there are non-contact offences, for example downloading illegal sexualised images of children.

Since the revelations about high-profile entertainment figures such as Jimmy Savile and the subsequent police investigation, 

Operation Yewtree, there are now more sex offenders in the prison system than ever before. There are about 11,700 out of a total population of nearly 85,000 in England and Wales, with an 8% spike in 2014.

For the first time ever, I was given unprecedented access to HMP Whatton to find out what's being done there to rehabilitate some of the most despised and feared people in society.

(BBC)