"A former police spymaster who spent years living deep undercover in the protest movement has confessed he tricked an innocent woman into having a long-term relationship with him, as part of an elaborate attempt to lend 'credibility' to his alter ego."

"Bob Lambert, who adopted a false identity to infiltrate leftwing and animal rights groups, said he had the 18-month relationship with the woman, who was not herself involved in political activism, as part of his cover story.

The Guardian has detailed the cases of seven undercover police officers known to have infiltrated protest movements, mostly in the past decade. Of those, five have had sexual relationships with women who were oblivious to their real identities."

Paul Lewis and Rob Evans report for the Guardian October 23, 2011. [2]