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The white British proportion is officially below 50 per cent in Leicester, Luton and Slough.

Analysts said the same will be true of the country’s second city, Birmingham, by the end of the decade.

The researchers at Manchester University attribute the shifting balance to the wave of eastern European migration fostered by the previous Labour government.

Their analysis of the 2011 UK Census shows Slough has the smallest proportion of white Britons at just 35 per cent.

Indians and Pakistanis make up half of the Berkshire town’s foreign contingent.

The populations of Leicester and Luton are both 45 per cent white British.

Leicester’s second largest ethnic group is Indians who make up a third of the city’s residents. In Luton, one in five residents is Pakistani or Bangladeshi.

The overall white population tops 50 per cent in Leicester and Luton when Eastern European and Irish communities are added but no ethnic group is in the majority in any of the three cities or cities.

Alp Mehmet, of MigrationWatch, said: “When you look at the consequences of this kind of change long term the public will be dismayed and will be worried. This has happened as a direct result of Labour’s policy of mass migration which was foisted upon the country without any thought for the future effects.”

The immigrant population of England and Wales has grown by three million in the past 10 years and contributed massively to the changing face of modern Britain. The Census, which takes place every 10 years, offers a clearer picture of the state of the nation by breaking down the white population into white British, Irish, Irish traveller and other white.

London’s 3.7 million white Britons were already a minority – 44.9 per cent of the population – and researchers said the same could be true in Birmingham within seven years.

The east London borough of Newham is shown to be the most diverse local authority area in the country with a white British population of just 17 per cent.

Of Newham’s 308,000 residents, just 143,000 were born in the UK. And of those, only 52,000 declared themselves white British.

Of 18 different ethnic groups within the borough, 17 have populations of more than 1,000.