Casting around for an industry to study that would most clearly show the effects of interaction, he hit on Broadway musicals.

NEWYORKER: Groupthink

While I think the industry is pretty open on casting, it's not that open on making serious movies in general, and serious African-American movies are probably even harder to get financed.

CNN: Cover story: Where's the diversity at the Oscars?

The Home Office is casting its own net as wide as possible to garner innovative ideas - and is encouraging industry and even private individuals to come forward.

BBC: Anti-terror gun stops boats dead

Many magazine editors, modelling agents and casting directors say they want to use more diverse models, but can't because of industry expectations - with each blaming the other group for setting the tone.

BBC: Are thin women the enemy?