BAME are even fed up with it all

I disagree. They told the electorate their plans and then largely only did what they thought best, I assume, but then there is room for conspiracy in there.
There was no need, and no excuse, for uncontrolled migration. If we were short of Labour or skills then like other countries temporary work permits were perfectly able to be organised. Somewhere there was not an incapability of controlling immigration there always seems to have been a desire to have immigration higher than the public knew as even Crossman admitted when he said the figures could be manipulated to paint the picture that was not the true reflection of the actuality. This was at the time when some in the Home Office were providing Powell with accurate figures and he did not like that.