In 1993, an 18 year old black teenager, Stephen Lawrence was murdered in a racist attack in East London. The police messed up the investigation into his killers. The inquiry that followed led by the judge Sir William Macpherson was one of the most damning documents to emerge about the police – describing it as “institutionally racist”. Twenty years on the barrister and broadcaster Hashi Mohamed has made a documentary about what has happened since for Radio 4. We speak to him about the legacy of Macpherson, about stop and search, and whether the police still have more to do to tackle racism.

Producer: Philly Beaumont

And you can get Hashi’s documentary. Macpherson: What happened next - is on BBC Sounds