A joint inspection report published on 26 March 2026 describes HMP Magilligan in County Londonderry as one of the best prisons in the United Kingdom. The assessment by Criminal Justice Inspection Northern Ireland and His Majesty's Inspectorate of Prisons rated outcomes as good across safety, respect, purposeful activity, and preparation for release. Inspectors noted improvements since the 2021 review.

Jacqui Durkin, Chief Inspector of Criminal Justice in Northern Ireland, and Charlie Taylor, Chief Inspector of His Majesty's Inspectorate of Prisons in England and Wales, stated staff provide tailored support to individual prisoners. This contributes to low violence and use of force levels. Prisoners spend eight to ten hours out of cells daily, with most engaged in education, skills, work, or enrichment.

North West Regional College delivers education assessed as good quality, with 43 percent of qualifications at Level 2. Healthcare by South Eastern Health and Social Care Trust includes a learning disability nurse and the UK's first shared digital healthcare record. Inspectors identified 19 positive practices and noted 22 of 30 prior recommendations achieved or partly met.

Drug misuse poses the main risk to stability. A prisoner survey found 23 percent developed drug problems, including with prescription medication, while at Magilligan. Inspectors called for stronger drugs strategy, more funding, and shorter waiting lists for addiction services.

The prison holds 500 inmates in facilities built for 300, using Second World War Nissen huts for workshops. Justice Minister Naomi Long welcomed the report, highlighting respect and rehabilitation. Northern Ireland Prison Service Director General Beverley Wall stressed need for capital investment. Governor Gary Milling credited staff and partners.

A separate initiative at Magilligan operates a tree nursery growing native species with peat-free methods. It supports prisoner skills and rehabilitation through sales to households, groups, and businesses.