Blue List (UK)

The Blue List is the authoritative register maintained by the Protocol Directorate of the Foreign, Commonwealth and Development Office (FCDO) enumerating every foreign diplomatic agent accredited to the Court of St James's, together with eligible family members forming part of their household. Its legal foundation rests on the Diplomatic Privileges Act 1964, which incorporated the Vienna Convention on Diplomatic Relations (VCDR) of 18 April 1961 into United Kingdom domestic law. Article 10 VCDR obliges the receiving state to be notified of the appointment, arrival and final departure of mission members, and Articles 29–36 set out the privileges and immunities the Blue List operationalises. The roster is sometimes informally paired with the so-called "White List" of administrative and technical staff and the "Yellow List" of consular officers, though these working terms are not statutory.

Inclusion on the Blue List is procedural and follows a defined notification sequence. A sending state's mission submits Form FCO 2 (or its current electronic equivalent through the eDiplomat portal) to the Diplomatic Missions and International Organisations Unit within Protocol Directorate at King Charles Street. The submission identifies the individual, rank, diplomatic passport details, date of arrival, and the dependants accompanying the officer. Protocol vets the notification against the criteria in Article 1 VCDR (definitions) and Article 8 (nationals of the receiving state are excluded absent express consent). Once accepted, the FCDO issues a diplomatic identity card — colour-coded by category — and the individual's name is entered on the Blue List, triggering inviolability of the person under Article 29 and immunity from criminal jurisdiction under Article 31.

The List is reissued periodically by Protocol and circulated to the Metropolitan Police's Diplomatic Protection Group, His Majesty's Revenue and Customs, the Driver and Vehicle Licensing Agency, Border Force, and the Crown Prosecution Service. These distributions are operational rather than public: the Blue List is not published in the manner of the United States Department of State's Diplomatic List (the "Blue Book"). Vehicles registered to Blue List individuals carry distinctive "D" prefix diplomatic plates, and parking and congestion-charge enforcement is suspended in accordance with Article 34. Removal from the List follows notification of departure, declaration as persona non grata under Article 9 VCDR, or termination of functions; a reasonable period — customarily measured in weeks rather than months — is afforded for departure thereafter.

Contemporary practice illustrates the List's centrality. When the United Kingdom expelled 23 Russian intelligence officers in March 2018 following the Salisbury poisoning of Sergei and Yulia Skripal, then-Prime Minister Theresa May's statement to the Commons on 14 March 2018 was operationalised by Protocol's striking those names from the Blue List and the issuance of departure deadlines by the FCDO. Similarly, the accreditation dispute surrounding Anne Sacoolas in 2019 — wife of a US official attached to RAF Croughton — turned on whether her status as a notified dependant on the equivalent register conferred immunity in the death of Harry Dunn. Following that case, the UK and United States amended the Croughton Annex in July 2020 to remove criminal immunity for personnel and their families stationed there.

The Blue List should be distinguished from several adjacent instruments. It is not the Diplomatic List published commercially or by foreign ministries elsewhere; it is an internal working register. It is separate from the Consular Corps List, which records officers accredited under the Vienna Convention on Consular Relations of 1963 and the Consular Relations Act 1968 — those officers enjoy the narrower functional immunity of VCCR Article 43. It is also distinct from the register of staff of international organisations headquartered or represented in London, whose privileges flow from the International Organisations Act 1968 and individual headquarters agreements such as that with the International Maritime Organization. Finally, Blue List status is not equivalent to indefinite leave to remain: time spent in the UK as a diplomat does not count toward settlement under Paragraph 39E of the Immigration Rules.

Controversies recur. The annual FCDO parliamentary written answer on unpaid parking fines, congestion charges and serious offences by diplomats — released customarily each summer — draws attention to the immunities the List embodies. The London congestion charge dispute with the United States Embassy, ongoing since 2003 and now exceeding £15 million in claimed arrears, illustrates the limits of receiving-state recourse: the FCDO can request waiver under Article 32 VCDR but cannot compel it. Debates over the size of certain missions, most prominently the Chinese Embassy's proposed Royal Mint Court relocation and the post-2022 reduction of the Russian mission, have placed Protocol's quiet management of the List under sharper political scrutiny. The 2020 Sanctions and Anti-Money Laundering Act regime has added a further screening layer for designated individuals seeking accreditation.

For the working practitioner — desk officer, mission administrator, or legal adviser — the Blue List is the operative document determining whether a given individual may be arrested, served with process, taxed, or required to give evidence in a UK court. Verification with Protocol Directorate, rather than reliance on a diplomatic passport alone, is the standard of practice: accreditation, not nationality or passport class, governs immunity. Mission heads should treat timely notification of arrivals, departures, and changes of function as a continuing obligation under Article 10 VCDR, since lapses can void the protections their staff assume they enjoy.