Question to the Home Office:
To ask the Secretary of State for the Home Department, what estimate her Department has made of the number of irregular migrants in the UK.
By its very nature, it is not possible to know the exact size of the irregular migrant population. In June 2019, the Office for National Statistics (ONS) published a note on ‘measuring illegal migration’.
The Home Office does publish statistics on detected irregular arrivals to the UK as part of the ‘Irregular migration to the UK’ quarterly statistics release.