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Trevor Philips, former chairman of the Equality and Human Rights Commission, said fear of causing offence has stifled debate.

Racial attitudes in Britain have been transformed since the first Caribbean immigrants landed in the UK after the war.

The kind of racism that was commonplace for years is now illegal.

But has debate on race issues been stifled? Have people who want to raise those issues been intimidated.

"I think we are too shy to talk about the real issues", said Trevor Philips, former chairman of the Equality and Human Rights Commission.

We live in a multi-cultural country that could scarcely have been imagined a couple of generations ago.

Mr Philips himself is black and he was the chairman of the Equality and Human Rights Commission for ten years.

He's made a documentary for Channel Four called Things we can't say about race that are true.