Despite an unusual advertising blitz that saw adverts promoting Prince Mohammed and Saudi Arabia appear in national newspapers and on taxis and electronic billboards across London, the visit was knocked from the British front pages by the poisoning of a Russian double agent.
Before his visit, the 32-year-old royal said both countries would be "much safer if you have a strong relationship with Saudi Arabia".
Saudi Arabia is leading a coalition of nine African and Middle Eastern countries in a military operation in Yemen in a bid to reinstall the internationally-recognized government of President Abdrabbuh Mansur Hadi.
A final deal would not resurrect those jobs, the company said, but would provide continuing employment to 5,000 people working on the Typhoons....
News of the sale comes as Crown Prince and de facto Saudi ruler Mohammed bin Salman visits the United Kingdom amid protests.
But no sooner than he landed, the 32-year-old was met by hundreds of protesters demanding an end to the violence in Yemen and an immediate halt to weapons sales from the United Kingdom to Riyadh.
Mrs May defended the UK's ties with Saudi Arabia earlier this week, saying all arms sales are strictly regulated.
The Crown Prince of Saudi Arabia Mohammad bin Salman leaves 10 Downing Street in London, March 7, 2018.
But the war he launched in Yemen has tarnished his image as a reformer and moderate. The military aggression has so far killed over 13,600 Yemenis.
The war is being led by bin Salman, also Saudi Arabia's defense minister, with the help of the USA and the UK.
However, the UK's opposition and aid sector have reacted angrily to the deal amid growing concerns over Saudi Arabia's war crimes in neighboring Yemen.
The British prime minister was expected to address the humanitarian issues of the Yemen war with the Saudi crown prince at a private dinner inside her country residence on Thursday.
Downing Street said the framed document was originally created by Queen Victoria's consul general in Jeddah in 1880.
The UK has increased its weapons sales by around 500 percent since the onset of the Saudi invasion, according to a report by The Independent.
However, British arms companies are reported to have reaped huge benefits from the fighting, earning more than 6 billion pounds ($8.3bn) in trade with Saudi Arabia since 2015 - when the kingdom launched its massive aerial campaign against Houthi rebels.