Here is one of the Tristars demonstrating that the RAF was not in the business of risking the lives of Her Majesty Queen Elizabeth II and other members of the Royal Family, 8M+ inhabitants of London, the crew and a load of teenage air cadets on board by flying a non- airworthy aircraft over Buckingham Palace and Central London.

Then for good measure, diverting on a real Quick Reaction Alert mission to refuel a Typhoon fighter intercepting an actual rogue transport aircraft being ordered to land in Scotland - all before returning home for afternoon tea !

https://www.youtube.com/watch?v=b6LqTD7h6Hg