Ethnic minorities are set to make up a fifth of the UK population in 40 years, a University of Leeds study predicts.
It says the proportion of black, Asian and other ethnic minorities will rise from 8% of the population, as recorded in the 2001 census, to 20% by 2051.
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Researchers say the population will reach nearly 78 million - up from 59 million in 2001.
One of the authors, Professor Philip Rees, said the UK's ethnic make-up was "evolving significantly".
He said: "Groups outside the white British majority are increasing in size and share, not just in the areas of initial migration, but throughout the country, and our projections suggest that this trend is set to continue through to 2051.
"At a regional level, ethnic minorities will shift out of deprived inner city areas to more affluent areas, which echoes the way white groups have migrated in the past.
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"In particular, black and Asian populations in the least deprived local authorities will increase significantly."
The Leeds study suggested the population is also set to become more racially diverse as well as less segregated over the coming years.
Other groups set to increase rapidly include those of south Asian origin and from countries such as India, Pakistan and Bangladesh, where immigration into the UK has been high in the past.