We recommend that within the next 12 months the Government formalises and publishes guidance outlining criteria for determining whether the detention of a UK national by a foreign state is considered arbitrary and at risk of being used for state leverage. Subsequently a review should be carried out of all UK nationals detained overseas according to the established criteria. The conclusions on the nature of the detention should be used to classify the case internally, in discussions with the family and, where appropriate, publicly. Where not deemed to meet the criteria, cases should be subject to ongoing assessment with the involvement of families.