AN UNDERCOVER officer who slept with four women while infiltrating protest groups admitted to a public inquiry today that his actions were wrong and inappropriate. 

The ex-cop, who used the cover name Vince Miller during his deployment in the 1970s, conceded that had the women known his true identity they would not have had sex with him. 

He did not use contraception with the women or consider the risk of pregnancy, the public inquiry into undercover policing heard.

Giving evidence, “Mr Miller” said he took responsibility for sleeping with his targets and admitted that his behaviour was “definitely wrong.” 

The former officer is one of at least 20 spycops who deceived campaigners into sexual relationships while serving in secret police units that infiltrated more than 1,000 protest groups over 40 years. Four officers are known to have fathered children while undercover. 

Abuses by these units are under investigation by the undercover policing inquiry, headed by retired judge Sir John Mitting. 

Earlier the inquiry heard from one of the women, known only as Madeleine, who said she felt betrayed by “Mr Miller,” who had infiltrated the left-wing Socialist Workers Party group she was involved with in the 1970s. 

The officer dismissed her reaction as “a little over the top” and a “very strong word for what happened.” 

“Mr Miller” justified not using contraceptives by claiming that it was equally as much up to Madeleine to press to use protection as him, as she was “a full feminist socialist supporter” and not a “shrinking violet.” 

Madeleine has accused “Mr Miller” of lying to the inquiry about the nature of their relationship. 

Giving evidence on Monday, she said they had a relationship that lasted a few months after sleeping together at a party: he claims that they had a one-night stand.

“Mr Miller” maintained his version of events today, insisting that he slept with Madeleine once after she invited him to her bedroom. Asked by David Barr QC, the inquiry’s lead council, if he went to her bedroom because he wanted to have sex, despite being a serving police officer on duty, “Mr Miller” replied: “I think I’d have to say yes.”

Inquiry chair Sir John Mitting pressed “Mr Miller” to explain why his account of the relationship differed significantly from Madeleine’s, who he considered a sincere and truthful person.

Responding, the ex-officer suggested she might be trying to “diminish the reputation of undercover officers.” 

The inquiry continues.