Question to the Home Office:

To ask the Secretary of State for the Home Department, what recent estimate she has made of (a) the number of immigrants in the UK without legitimate immigration status and (b) the three most common countries from which such people originate.

Government estimates on the number of illegal migrants currently in the UK are
not available. Given the clandestine nature of illegal migrants, any
estimation is extremely difficult and there would be considerable uncertainty
around any estimates.