How did the Changing Social Landscape lead to a 'racialisation' of British Politics?

This social landscape lead to a 'racialisation' of British politics as they mas much anxiety as to the amount of 'coloured' immigrants in Britain, this was uttered by the Conservative Party. The prospect of black immigration was immediately viewed negative as two days after the Empire Windrush a letter was sent to Prime Minister Clement Attlee (at the time) by 11 Labour MP's pleading for the control of Black immigration. During these years black individuals were portrayed as scapegoats as they were blamed for the growing difficulties that the British economy. In the year 1962, introduced the first legislation act which restricted entry on British Commonwealth citizens by making primary immigration dependant on the ownership of a work voucher.