Mark Kennedy/Stone
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Role of undercover Pc questioned after he switches sides

Pc Mark Kennedy passed himself off as a green campaigner for seven years.

But the trial of six environmental activists who were part of the group he infiltrated collapsed after he offered to give evidence on their behalf.

Richard Watson produced this exclusive report for BBC Two's Newsnight.

Broadcast on Monday 10 January 2011.

  • 11 Jan 2011