The United Kingdom is sending RAF Typhoon fighter jets, an A400M transport aircraft, and military advisers to Saudi Arabia in what the Ministry of Defence describes as a defensive role against Houthi missile and drone attacks. The jets will not strike the Houthis directly, the MoD says, but the UK is extending air-to-air refuelling support for Saudi operations — including those targeting Houthi military positions in Yemen. The distinction between defensive deployment and offensive enablement is, as always, doing heavy lifting. The relationship being invoked here is not new. It traces to December 1915, when Sir Percy Cox signed the Treaty of Darin with King Abdulaziz Ibn Saud, exchanging British cash and weapons for an alliance against the Ottoman Empire. A follow-on treaty was signed in Jeddah in 1927. By the time Abdulaziz founded the Kingdom of Saudi Arabia in 1932, Britain was already the kingdom's primary external patron. The current deployment is not an escalation — it is a continuation. The commercial architecture of this relationship crystallised in the 1960s. In 1966, Saudi Arabia bought 40 Lightning fighter jets and 25 jet trainers from the British Aircraft Corporation. BAE Systems dates its Saudi ties to that year. In 1973, a memorandum of understanding made BAE the prime contractor. Then came Al-Yamamah in 1985 — the largest export contracts in British history, according to Reuters — under which Saudi Arabia set aside up to 600,000 barrels of oil a day to pay for Tornado jets and other equipment. A Serious Fraud Office investigation into corruption allegations was opened in 2004 and killed in 2006, with Attorney General Lord Goldsmith citing national security. The Typhoon era began in 2007 when Saudi Arabia agreed to buy 72 jets for £4.43 billion (then about $8.9 billion). BAE called it the Salam Project. During Crown Prince Mohammed bin Salman's 2018 London visit, the UK signed a memorandum of intent for 48 more Typhoons. That deal stalled when Germany — which co-manufactures the Typhoon and holds export veto power — halted arms sales after the murder of journalist Jamal Khashoggi. Berlin dropped its objection in January 2024, with then-Foreign Minister Annalena Baerbock citing the changed security landscape after October 7, 2023. Yemen has been the persistent complication. In June 2019, the UK Court of Appeal ruled the government had acted unlawfully by licensing Saudi arms sales without assessing whether past incidents breached international humanitarian law. New licences were halted. By July 2020, then-Trade Secretary Liz Truss told Parliament they would resume, arguing there was no clear risk of serious legal violation. RAF Typhoons joined US strikes on Yemen in 2024 after Houthi attacks on Israel-linked Red Sea shipping. In September 2025, Britain sent a Voyager tanker for Saudi air-to-air refuelling — of British-built Typhoons flown by Saudi pilots. The pattern is structurally simple: Britain builds the jets, sells them to Saudi Arabia, provides the pilots or refuelling when needed, and uses the legal system to manage the political fallout. BAE Systems captures the revenue. Saudi Arabia gets air superiority. The Houthis and Yemeni civilians absorb the kinetic consequences. British courts and Parliament intermittently raise objections that are overridden by executive decisions citing security or commercial necessity. This has been the operating model since the 1960s, and nothing in the current deployment suggests deviation. The 'defensive' framing of the Typhoon deployment is the latest iteration of a rhetorical strategy that has accompanied every escalation in this relationship. Air-to-air refuelling for offensive Saudi sorties was already underway. Transport aircraft and advisers deepen operational integration. The legal and ethical lines that UK courts have drawn — most significantly in the 2019 ruling — have been crossed and re-crossed with minimal lasting consequence. The relationship is not a policy choice subject to review; it is infrastructure.