We Could Have Told You That, Mr Cameron!

So, The British Prime Minister has come out and said that multi-culturalism isn't working. From what I understand, his assertion is that in encouraging this, all we have done is polarize minority groups: calvanised their sense of separateness from the British identity, and encouraged rather than prevented, extremism.
As the title suggests, this is something which most of us have watched for the past thirty or so years, hardly daring to say anything, though, lest we be called - horror of horrors - racist.
Now, I respect other cultures and therefore, am not suggesting that those who worship differently, dress differently and speak differently should be made to give up their cultures. What I do hope happens, though, is that everybody in Britain adopts a sense on oneness, bourne out of a love for their country and respect for each other.