Orca
Last Vulcan attack in mid June dropped bombs fitted with VT fuses which should have been set to air-burst over the airfield. I got the chance to read the official RAF history (the secret one) in 89 and it stated that the fuze settings had been incorrectly set in the cockpit and this had lead to a unit inquiry. According to the wiki entry on the Black Buck raids, one of the sources at the bottom of the page states that an official history published in 2005 states that the fuze's had been set to impact and the stick had missed the airfield by a wide margin.