Back in the distant years of my youth, I saw a Vulcan fitted with a Concorde style nacelle under it's belly with a singleRR Olympus on addition to the 4 standard engines. I know the standard engines are Olympus too but the Olympus designed for Concorde was an entirely different engine, and this was the flying test bed. Would you believe the damn thing went vertical with the normal 4 engines at flight idle?!. Vulcans were always VERY noisy, and the sheer size of the shadow it casts gives at a presence in the sky which as far as I know is unmatched. There is a "live" Vulcan at bruntingthorpe which is regularly fast taxied almost to the point of unstick, (how can they resist the temptation to pull back just a little) and there are hopes of returning the last service example XH588 to the air, but funding is proving a problem.