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<p>Any estimate of the exact size of the illegal population is extremely difficult
and there would be considerable uncertainty around it. Similarly this applies to any
estimate of the size of the illegal population committing crimes not least because
not all crimes committed come to the attention of the authorities or lead to arrests;
convictions; or removal action.</p><p>Exit checks were introduced in April 2015 and
are, over time, providing more detailed insights into the behaviour of migrants and
how they comply with the restrictions placed upon their length of stay in the UK.
Instead of producing inaccurate numbers, the Government is focused on making it harder
for people to live in the UK illegally.</p>
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