{"metric":"detention_leaving_by_length","title":"People leaving immigration detention by length of detention","topic":"migration","unit":"people","measure_type":"count","geography":"K02000001","comparison_method":"same_quarter_previous_year","latest":{"period_start":"2026-04-01","period_end":"2026-06-30","period_label":"2026 Q2","value":4691,"status":"provisional","vintage":"2026-08-27"},"comparison":{"period_label":"2025 Q2","value":5551,"vintage":"2026-08-27"},"source":{"publisher":"Home Office","publication":"Immigration system statistics: people leaving immigration detention dataset","landing_url":"https://www.gov.uk/government/statistical-data-sets/immigration-system-statistics-data-tables","sheet":"Data_Det_D03","table":"Det_D03","row":"all rows","column":"Leaving","raw_value":"sum of 1654 rows","file_url":"https://assets.publishing.service.gov.uk/media/6a85c4491b45e4e555421edc/immigration-detention-datasets-jun-2026.xlsx","file_sha256":"51b4d9100ad36864bec21ce0eb9467839518ebaedfa0da128b52f8a7603634bd","release_date":"2026-08-27","release_label":"Year ending June 2026"},"definition":"The number of people who left immigration detention in each quarter, split by how long they had been detained, from up to three days to over four years.","does_not_measure":"How long people still in detention have been held (that is the detention population snapshot), or time spent across separate spells of detention.","links":{"page":"/migration/detention-leaving-by-length","series":"/api/metrics/detention_leaving_by_length/series","vintages":"/api/metrics/detention_leaving_by_length/vintages"}}