Nearly two thirds of the public believe that migrants are not integrating well into British society, according to a poll.

Research by YouGov found concern over how arrivals were fitting in rose to 79 per cent among those who voted for Brexit in the historic EU referendum.

By contrast, among people who supported Remain the figure was much lower at 38 per cent.

The YouGov poll asked for views on how well people thought migrants had integrated into British society

The results of the survey, conducted for of social integration charity The Challenge, underline the importance of immigration in the referendum result.

They emerged as the government prepares to publish an official review of integration.

The study by Dame Louise Casey is said to criticise ministers for failing to manage immigration better, tackle extremism and help minorities fit in.

The assessment has apparently been ready for months but its publication was delayed after Home Office officials expressed ‘unhappiness’ about its content.

It is said to cite a lack of a strategy to integrate communities, with some areas becoming Muslim-only zones, and the failure to promote and defend a programme designed to counter radicalism.

The poll, carried out earlier this month, found 58 per cent 58 per cent believe migrants are not integrating well into British society.

An official review of integration by the Dame Louise Casey is due to be released soon

It suggests that older voters are less likely to believe migrants have integrated well.

While almost half - 47 per cent - of 18 to 24 year olds think migrants are fitting in well, the figure was just 19 per cent for those aged 65 or over.

Some 84 per cent of Ukip voters at the 2015 general election and 72 per cent of Tory voters think migrants are not integrating well - compared to 47 per cent of Labour supporters.

More than a third of those questioned thought British nationals should be doing more to help immigrants integrate into British society.