Policy pledge by shadow home secretary would get rid of rules that split up migrant families

Diane Abbott, the shadow home secretary, is to announce a Labour policy pledge on Wednesday to end “family break-up through the immigration system”.

Abbott is due to use her speech to outline the “fair and reasonable values” upon which Labour will base its immigration policy, a day before the quarterly publication of the net migration figures.

The migration data are expected to show growing evidence of a “Brexodus” with fewer European Union nationals coming to live in Britain and more leaving the country.

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Abbott will renew Labour’s commitment at the last general election to scrap the government’s “false and unworkable net migration target” of bringing levels down to below 100,000 a year.

She is to highlight the fact that Theresa May’s target, and the hostile environment measures put in place that have so far failed to achieve it, are “leading to the scandalous situation where we are turning away doctors, even though there is a severe shortage of trained personnel in the NHS”.

The new commitment to ending family break-up in the immigration system will be explained, Abbott saying: “We will allow the carers or parents of admitted child refugees to come here. We will also end the practice of deporting the children, currently without entitlement to be here, once they turn 18, even when their parents are entitled to be here.”

It is “neither fair nor reasonable to break up families” in this way, according to Abbott. She is also to promise to use the speech to identify a large number of other current policies that do not comply with Labour’s “fair and reasonable values” and which will be altered or discontinued.

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In recent weeks Abbott has been arguing that the immigration system is broken, not because it is not “tough” enough but because it lacks humanity and is based on meaningless targets rather than the priorities of jobs, growth and prosperity.

She has also sharply criticised the use of immigration detention without a time limit, promising that Labour will deal with all cases promptly and efficiently, and allow those who are entitled to stay to do so, and to deport those who are not.

Abbott’s intervention comes after the home secretary, Amber Rudd, confirmed that the long delayed government white paper on post-Brexit immigration had been postponed again and would be unlikely to appear before the autumn.