Immigration
The question
To ask the Secretary of State for the Home Department, if she will make an estimate of the number of migrants who have arrived illegally in the UK since 4 August 2025.
Answered by Alex Norris
By its very nature, it is not possible to know the exact number of people who arrive to the UK illegally, and so we do not seek to make any official estimates of this. In June 2019, the Office for National Statistics (ONS) published a note on ‘measuring illegal migration’.
However, the Home Office does publish statistics on detected irregular arrivals to the UK in the ‘Immigration System Statistics Quarterly Release’. Data on detected irregular arrivals by method of entry is published in table Irr_D01 of the ‘Irregular migration to the UK detailed datasets’, with the latest data up to the end of June 2025. Data for July to September 2025 will be published on 27 November 2025. Data on daily small boat arrivals is published at: Small boat activity in the English Channel - GOV.UK.
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