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There are several of the V bombers across the country - hence XH558 flying over them all as part of its farewell tour. http://www.vulcantothesky.org/news/677/82/Report-on-the-V-Force-Tour.html

I don't know how many of them you can access the cockpit but that is certainly the case at Newark Air Museum. They are open 361 days of the year and their Twitter account usually states what cockpits are open on any particular day. http://www.newarkairmuseum.org/ @NewarkAirMus