Paedophile Derek Slade, who was headteacher at schools in Norfolk and Suffolk, is due to be the subject of a hard-hitting BBC1 documentary tonight.

Slade, who was head of the former St George's School at Wicklewood, near Wymondham, and Great Finborough, near Stowmarket, was jailed for 21 years after being convicted of 50 offences last year.

Among the 62-year-old's convictions were sex assaults on pupils dating back to the 1970s and 80s including serious indecent assault and indecent assaults. He also committed actual body harm and admitted 17 offences relating to child pornography, as well as one of possessing a false passport.

Slade's reign of terror at St George's, and its earlier incarnation at Wicklewood was originally exposed by investigative reporter Roger Cook.

In the early 1980s Cook lifted the lid on the physical abuse suffered by pupils who lived under the strict regime of corporal punishment laid down by Slade.

The expose on the BBC Radio 4 programme Checkpoint led to national inquiries into the allegations about Slade.

Following Slade's imprisonment last September, Cook has made a follow-up documentary for Inside Out entitled Abuse of Trust. It is due to air at 10.35pm on BBC1 tonight.

Slade, formerly of Burton-upon-Trent, was originally exonerated of wrongdoing at an official inquiry but he was later convicted and jailed for assaulting a pupil at a school in Sussex. His sentence was overturned on appeal.

He then went overseas to set up schools in impoverished areas, leading to suspicions of further abuse.

Abuse of Trust follows his career, investigating how a man with such an appalling record was able to deceive charities and businesses and work with vulnerable children.

One of Slade's victims from St George's has been interviewed for the programme and has said he will waive his anonymity. The man, who asked not to be named until the programme aired, said: 'I was sick of hiding. The shame belongs to him and not to me. Why should I hide? I was absolutely sick of being made to feel I am a victim, like I was when I was ten. I won't hide in the shadows.'

Suffolk Police are still continuing their inquiry into allegations about St George's.

A week ago it emerged that 35 ex-pupils are taking legal action against Anglemoss Ltd, the company which ran the school, claiming sexual and physical abuse.