'I was ridiculed for asking for better black roles'

The London Film Festival opened this week with a film directed by a black woman for the first time in its history. But can talking about diversity and celebrating past successes actually achieve anything?

Actor David Harewood, best known for his roles in Blood Diamond, Homeland and The Night Manager, tells the Today programme he was ignored and ridiculed for raising the issue of the lack of aspirational, authoritative black characters.