Francis Hallam, a colleague of Mr Woodhead's at Gordano School, near Bristol, in mid-1970s, will testify that the relationship with 17-year-old Amanda Johnston began before she left school.
Legislation now before parliament will make such relationships a criminal offence, punishable by a two-year prison sentence. Education secretary David Blunkett has so far rejected calls for an inquiry into the affair. This week David Hart, general secretary of the National Association of Head Teachers, will refer the matter to the director of public prosecutions.
Mr Hallam told The Observer he would be prepared to reveal the truth in a court of law or answer questions from an official inquiry. He said he had only remained silent so far out of loyalty to his old
PRINCE CHARLES PRAISES BESIEGED WOODHEAD
The prince of Wales has thrown his full support behind Chris Woodhead, who faces a police investigation into alleged perjury over his affair with a girl who was his sixth-form pupil 23 years ago, according to The Sunday Times (p1).
Prince Charles has contacted Tony Blair - another strong Woodhead supporter - to express his concern. He has also written an encouraging letter to the chief inspector and entertained him at a private dinner with Camilla Parker Bowles at St James's Palace after the latest allegations were made by Mr Woodhead's former wife.