UK immigration statistics and the crime-data gap
Official arrival, asylum, detention and return datasets are useful - But they do not provide a national crime breakdown by immigration route or asylum status.
No valid small-boats-to-crime calculation exists in these releases.
Nationality overlaps between two datasets do not prove that the same people appear in both. CrimeRate will not infer an offence rate by joining unrelated aggregate tables.
Detected arrivals in the year ending June 2026
These figures measure routes, not offences
They count detected immigration events. They are not criminal-justice statistics and do not show whether a person committed a crime.
Nationality is published for arrivals
Nationality is not an offending measure
The five most common recorded nationalities were Eritrean, Sudanese, Afghan, Somali, Iranian. This describes detected arrivals during the period only.
What can be linked?
Use only a relationship the source publishes
Matching words across two tables does not prove that the same people appear in both. The matrix separates available evidence from unsupported inference.
QuestionPublished answer?Responsible interpretation
Arrivals by route and nationalityYesUse Home Office immigration tables.
Asylum decisions for small-boat arrivalsYesUse the dedicated cohort tables and their lag caveats.
Crimes by asylum-seeker statusNoONS says it does not hold this breakdown.
Crimes by small-boat arrival statusNoNo published national person-level linkage establishes it.
Foreign nationals in custodyYesAvailable by nationality, but route and asylum history are not supplied.
FNO returns by nationalityYesUse Home Office returns definitions; do not infer original arrival route.
What ONS says
In its January 2026 response, ONS stated that it does not hold crime breakdowns by asylum-seeker or migrant status. It does publish victimisation characteristics including UK-born and non-UK-born, which is a different question.
Do not substitute country of birth
Country of birth, nationality, ethnicity and immigration status can all differ for the same person. None is a proxy for another.
Open the Office for National Statistics response →Related crime and demographic evidence
Each page uses a different population, reference period and statistical unit. Keep those definitions attached when moving between them.