Question to the Home Office:

To ask the Secretary of State for the Home Department, what proportion of immigration detainees who are (a) foreign national offenders, (b) foreign national offenders subject to deportation under the UK Borders Act 2007 and (c) other detainees were held in immigration detention for (i) 28 days or fewer, (ii) over 28 days but less than four months, (iii) over four months but less than 12 months and (iv) over 12 months in each year since 2015 to date.

Providing the information requested would require a manual check of individual records which could only be done at disproportionate cost.

The Home Office publishes the number of Foreign National Offenders currently detained. The data can be found in the quarterly Immigration Enforcement Transparency Data: https://www.gov.uk/government/publications/immigration-enforcement-data-november-2018

The Home Office also publishes data on immigration detention, including the length of detention of those leaving detention (table dt_06_q) and the length of detention of those in detention at the end of each quarter (table dt_11_q). The data can be found in the detention tables in the latest Immigration Statistics, year ending September 2018, quarterly release.