The European Social Survey asked a representative sample of the British public two questions on biological racism*.
18% of the respondents agreed with the statement that “some races or ethnic groups are born less intelligent than others”, and 44% said yes when asked whether “some races or ethnic groups are born harder working than others”.
It’s quite likely the difference between these two percentages is due to political correctness. A claim that there are innate group differences in intelligence would be widely recognised as a blatantly racist statement, whereas innate differences in work ethic may not have the same connotations.
Whichever figure you go with, the evidence does suggest there is still a substantial minority of the British public that subscribe to some form of biological racist dogma.
*Biological racism is the pseudo-scientific belief that some individuals or groups are born with different inherited potentialities like intelligence, to reinforce the ideas of racial hierarchy and the notion that there are innate differences between racial or ethnic groups, which, by their very nature, makes some groups inherently superior to others.