The family of Mark Duggan, whose shooting by police sparked the 2011 London riots, ask the appeal court to judicially review police post-incident procedures. Watch the broadcast, in association with Sky News.

They want principal witnesses to be kept isolated before being interviewed so they do not have a chance to confer. They are joined in the appeal hearing by the family of Ryszard Delezuch, who died after being detained by Leicestershire Police officers.