Undercover policeman Mark Kennedy 'upset' by accusations of state-sanctioned abuse

15 June 2011 Last updated at 10:48 ET Help

Undercover cop Mark Kennedy lived a double life, infiltrating environmental protest groups as 'Mark Stone' and reporting information back to his police handlers.

The married policeman also had a serious relationship with one of the protesters.

In an exclusive in-depth interview, Kennedy told BBC Radio 5 live: "I spent many, many hours with [the protesters] every day."

"I met this person and it happened," Kennedy explained to Victoria Derbyshire. "It's upsetting, yeah."

You can hear other BBC Radio 5 live highlights by visiting the Best Bits section on the website.

Victoria Derbyshire broadcasts Monday - Friday 1000 - 1200 on BBC Radio 5 live.

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