If the dear old VC10 sufferes a total hydraulic failure, you lose flaps, slats, spoilers, tail trim, brakes (except for whatever is left in the accumulators) and nosewheel steering. But you can free-fall the landing gear, make an approach at Vat + 45 and hope that you know where the longest runways are...(LHR and FRA in Europe!!). It has been done in the past, I believe, when one of the re-possessed EACC Super VC10s landed at Filton with no hydraulics.