Saturday, September 18, 1999 Published at 11:31 GMT 12:31 UK
Straw pressed over third spy
Dr Pearson gave information about Nato staff to the Stasi
Home Secretary Jack Straw is being urged to make a full statement about foreign agents after the third Briton in a week was unmasked as a spy.
A joint investigation by the BBC and Washington's Insight magazine revealed that Dr Robin Pearson, a lecturer in economic history at Hull University, spied for 12 years for East Germany's notorious Stasi secret police.
A former KGB agent has also claimed this week two Labour MPs, Tom Driberg and Raymond Fletcher - both now dead - had been spies.
The Home Office said Mr Straw had been briefed about the case, by MI5, only last weekend.
Mr Straw is coming under increasing pressure to make a statement in the House of Commons about Britain's "forgotten spies".
Shadow Home Secretary Ann Widdecombe said: "I've been asking Jack Straw for over a week for a comprehensive statement.
"Every day there has been another development to this farce.
Dr Pearson was recruited by the East German secret police, the Stasi, in 1977 and served as a "long-term penetration agent" for 12 years.
But four files survived, including one which contained information on a British Stasi agent codenamed "Armin".
He has now be revealed as Dr Pearson, a 44-year-old lecturer who is married with two children.
A Hull University spokesman said there would be no disciplinary action against Dr Pearson, who is reportedly on holiday.
He told the BBC: "Whatever Dr Pearson has been doing in his private life is a matter for him.
"Our responsibility as an employer is to ensure he carries out his duties as teacher, researcher and an academic in a satisfactory way and there is no doubt that he has done so.
"There is no question of disciplinary action, but obviously we shall want to talk to Robin to get his side of the story."
The Spying Game is on BBC Two at 8pm on Sunday 19 September.