A plane carrying new Foreign Secretary Boris Johnson had to make an emergency landing on its way to Brussels.
The plane, described by the Ministry of Defence as a small military aircraft, had a "technical issue" after it took off from RAF Northolt on Sunday afternoon and had to land at Luton Airport.
A Foreign Office spokesman said: "There was a technical issue on the RAF flight on Sunday afternoon carrying the Foreign Secretary and his officials from London to Brussels that required the aircraft to land at Luton Airport.
"The Foreign Secretary thanked the RAF crew for their professionalism and was grateful to Luton Airport for the brief, unscheduled welcome.
"After a short delay the Foreign Secretary continued on his way to Brussels by alternative means."