The mother of murdered Stephen Lawrence has called for a judge-led public inquiry into undercover police who spy on political campaigners.

Police chiefs have conceded undercover officers were deployed to spy on supporters of her family's efforts to force Scotland Yard to properly investigate her son's racist murder.

Launching her campaign, Baroness Lawrence said that only "the most authoritative, public, transparent and legally robust framework possible" to investigate police actions will satisfy her own and the public's concerns. She added: "Only a judge-led public inquiry can perform that task."