For example, IIRC, after the Falklands bombing it was realised that the fuel burn of the Vulcan, under the particular conditions of that flight, was several tens of percent worse than had been assumed for many years beforehand.
Not so. The Vulcan fuel burn at high weight was entirely in accordance with the Operating Data Manual. The problem was that some complete idiot decided to use training weight rule of thumb figures which were grossly inaccurate at high AUW - nobody had flown the Vulcan at high weight for years as the nuclear bomb weighed considerably less than 21 x 1000lb conventional bombs. Fortunately the AAR planners insisted on ODM calculations after the fool had made such a nonsense of the planning.....