from butlincat .

Through the personal testimony of a former Special Demonstration Squad (SDS) officer, a joint investigation by Channel 4 Dispatches and The Guardian examines the ethically dubious tactics of a clandestine unit within the Metropolitan police and reveals the names of high-profile targets.

Peter Francis, who spent four years living undercover, is the first officer from the Metropolitan Police's SDS to publicly speak out.

His testimony includes allegations that SDS undercover police officers were asked to look for intelligence that could be used to discredit the family of murdered teenager Stephen Lawrence and their campaign.

Stephen Lawrence's mother, Doreen, and former Home Secretary Jack Straw both speak of their shock at hearing about the allegations.