# Diplomatic immunity: what it covers and what happens when it is abused

> The Vienna Convention makes diplomats almost untouchable by design, leaving waivers, expulsions and cases like Harry Dunn's to show how narrow the escape valves really are when immunity is abused.

*Section: World — By Liam Chen (World Affairs Reporter) — Published July 12, 2026 — 4 min read*

Canonical URL: https://dailyjunction.org/world/diplomatic-immunity-what-it-covers-and-what-happens-when-it-is-abused
Tags: diplomatic-immunity, vienna-convention, international-law, embassies, foreign-office

## Key takeaways

- The 1961 Vienna Convention, given force in UK law by the Diplomatic Privileges Act 1964, bars arrest and criminal prosecution of accredited diplomats and makes embassy premises inviolable even during a fire or a siege.
- Only the sending state can waive a diplomat's immunity, and the waiver must be express; the host state's sole unilateral remedy is to declare the individual persona non grata and expel them.
- The 2019 Harry Dunn case turned on a special annex covering US staff at RAF Croughton, and ended with the loophole for family members closed and Anne Sacoolas convicted by video link in 2022.

When Anne Sacoolas drove out of RAF Croughton on the wrong side of the road in August 2019 and killed nineteen-year-old motorcyclist Harry Dunn, she was on a plane back to the United States within weeks, and no British police officer could lawfully have stopped her. That is not a failure of the system. It is the system, working exactly as the 1961 Vienna Convention on Diplomatic Relations intends, and the reason 193 states have signed it is that every one of them wants the same shield for its own people abroad.

The Convention, written into UK law by the Diplomatic Privileges Act 1964, gives an accredited diplomat personal inviolability: no arrest, no detention, no criminal prosecution in the host state, full stop. Civil immunity is nearly as broad, with narrow exceptions for private property, inheritance and commercial activity outside official functions. The protection extends to a diplomat's household, and in descending degrees to administrative, technical and service staff of a mission. Embassy premises are inviolable too, under Article 22: British police cannot enter without the head of mission's consent, even to execute a warrant, even, in the classic law-school example, to put out a fire. The diplomatic bag cannot be opened or detained, and mission archives are untouchable wherever they are.

None of this rests on the idea that diplomats are above wrongdoing. The Convention's own preamble says the purpose is "not to benefit individuals but to ensure the efficient performance of the functions of diplomatic missions". The logic is brutally reciprocal. Around 22,500 people in the UK hold some form of diplomatic immunity, and the Foreign, Commonwealth and Development Office tolerates the resulting friction because British diplomats in hostile capitals depend on the identical rule. Weaken it in London and you weaken it in Moscow, Tehran and Pyongyang, where a trumped-up charge against a British embassy officer would otherwise be an easy instrument of pressure. Immunity is the premium on an insurance policy every foreign ministry pays.

The friction is real and measurable. The FCDO reports annually to Parliament on serious offences allegedly committed by people with immunity, typically a dozen or so a year, alongside millions of pounds in unpaid London congestion charge debts, with the US embassy the largest debtor. Most abuses are at that level: parking fines, business rates, employment disputes with domestic staff. The graver cases are rarer and harsher, because the remedies are so limited.

## The escape valves

Only the sending state can lift immunity, and Article 32 requires the waiver to be express. Waivers do happen: Colombia waived immunity in 2002 so a diplomat's son could be tried in London, and states sometimes waive for their own prosecutorial purposes. But no country can be compelled to do it, and most refuse. The host state's unilateral tool is Article 9: declaring an individual persona non grata, with no reasons required, after which the sending state must recall them within a reasonable period or see immunity stripped. Expulsion is the workhorse of diplomatic discipline, used in batches after the Salisbury poisoning in 2018, when the UK expelled 23 Russian intelligence officers under diplomatic cover and allies followed with more than 150.

Persona non grata status punishes the mission, not the person. The starkest illustration remains the 1984 killing of PC Yvonne Fletcher, shot from inside the Libyan People's Bureau in St James's Square while policing a demonstration. The Metropolitan Police besieged the building for eleven days, then watched everyone inside leave the country under diplomatic protection. Britain broke off relations with Libya; nobody was ever convicted. A state can also prosecute its own returned diplomat, and immunity lapses once a posting ends for acts outside official functions, but in practice departure usually ends the matter.

## What the Dunn case actually changed

The Sacoolas affair tested the narrowest of these valves. Her immunity flowed not from ordinary accreditation but from a 1995 exchange of notes covering US personnel at the Croughton intelligence base, under which the US had waived immunity for staff acting outside their duties, yet the waiver had never been extended to family members. The FCDO concluded she was covered; the US refused both a waiver and an extradition request. What followed was slow, partial and instructive: the loophole for family members at Croughton was closed in 2020, and in December 2022 Sacoolas pleaded guilty to causing death by careless driving at the Old Bailey, appearing by video link from the United States, and received a suspended sentence she will likely never feel.

That outcome satisfied almost nobody, which is the honest lesson. The Convention offers accountability through pressure, reciprocity and diplomacy rather than through courts, and when a sending state digs in, the host state's options run out quickly. Britain accepts that bargain with open eyes, because on any given day the beneficiary of the next hard case may be one of its own.

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Daily Junction — https://dailyjunction.org/world/diplomatic-immunity-what-it-covers-and-what-happens-when-it-is-abused