Migration Statistics

Debate between Bernard Jenkin and James Brokenshire

Thursday 26th June 2014 Westminster Hall

[Mr Jenkin]

In my remarks, I raised the question of the 2011 study conducted by the Home Office into the expansion of the use of separate migration survey data. That would cost only £2 million, so is much better value than increasing the size of the international passenger survey. Is the Minister going to come on to that point in his remarks?

[James Brokenshire]

My hon. Friend did mention that specific aspect. The current discussions with the ONS indicate that its current approach is, rather, to look at other forms of data—other administrative data, such as those from the Department for Work and Pensions—to better inform the statistics. That is its preferred option for this type of work. I give a commitment to discuss the issues again as part of our discussions with the ONS, but that is its preferred approach instead of setting up a separate survey. I have noted the point that my hon. Friend has made, following on from the Select Committee’s recommendations, and we will check and confer with the ONS that that remains its preferred response in providing more localised data in order to inform this subject more carefully. That is certainly the feedback that we have had thus far in respect of what might be beneficial or might help to supplement the information provided by the international passenger survey.

The proposal to increase the IPS may not provide the best value for money, but that does not mean that we or the ONS are at all complacent, or that we do not recognise where improvements can be made. In that context—I think my hon. Friend the Member for Windsor advanced this point—it has been acknowledged that there were problems with the IPS’s estimates following the large surge in eastern European migrants following EU enlargement in 2004. We know that the absence of transitional controls, unlike elsewhere, in the majority view resulted in an unprecedented and surprising number of new arrivals in the years that followed. As my hon. Friend the Member for Harwich and North Essex highlighted, that significant change also surprised the statisticians. That is why the ONS has taken steps since then to address the coverage of the IPS survey. The ONS is rightly independent and I cannot speak for it, but the revised statistics it has published indicate that some of the issues have been resolved by the size of the survey and some of the specific questions that are being raised as part of its migration statistics improvement programme. The problems that the ONS found were in the survey design, and they have been addressed by recalibrating the survey’s coverage and increasing the sample size as part of that programme.

Questions have been asked about whether the figures are reliable enough for the Government to use them as a basis for our aim on net migration. I accept that any reliance on a survey to monitor a policy objective inevitably means confidence intervals in the central estimates. However, this is not a new issue. Survey estimates have been used in this way for many years to monitor Government policy and societal changes more generally. They are well-established scientific techniques used to ensure that social surveys are well designed and their estimates robust. That is why I would take the advice of the UK Statistics Authority that the central statistical estimate derived from the IPS is currently the best available estimate of net migration.

It must also be remembered that we have a lot of information on migration to monitor migration policy from a wide range of other sources that provide a clear and coherent picture of trends. That picture is reported every quarter in the ONS’s migration statistics quarterly report, and I welcome the steps that the ONS is taking to improve the way in which the data are reported and presented. Those data sources continue to be developed and improved—for example, with the release of additional information by the Home Office on certificates of acceptance of study. The new data allow the public and us to see the impact of the Government’s policies to close down bogus colleges. My hon. Friends will no doubt be aware of my most recent announcements on this issue.

As well as reporting on trends, it is important to look at the impact of migration, and we are grateful for the excellent work of the ONS, through its reports from the 2011 census and other sources, in informing the British public clearly and authoritatively about the significant changes in population that we have seen over the past decade and the impact of migration on the make-up of the population in the UK.