Typical Marxist view defying logic in order to destroy Western civilisation (this is Marxisms end game)
How can you say there is no such thing as race when there are and have been for thousands of years clear genotype and phenotype differences.
the term your looking for is "citizenship", which is a social construct, while race is a biological difference between people that can be so extreme that some races have or lack some unique genes. the negroid race, for instance, lacks the FYA gene.
For those saying that there isn't any given British race this is true, but 99% of it is made up of EUROPEAN races, and for those who don't know what European races are:
http://lmgtfy.com/?q=european+races