Vulcan was the most successful of the three "V-bombers". The other two were Victor and Valiant.
Background: British scientists, with help from a German, a Swede, an Austrian and an industrial team at ICI, began the work that became the Manhattan Project (known as Tube Alloys). This genesis of Manhattan played key roles in developing both designs of A-bomb dropped on Japan.
However, the 1946 U.S. McMahon Act prevented post-war cooperation on nuclear weapons, so the UK decided to produce its own, plus the means to deliver it. In the 1940s, this meant high altitude, transonic, strategic bombers.
Once the Soviets developed missiles that could attack V-bombers at high altitude, the mission switched to low-level attack. However, the Valiant and Victor proved unsuitable in that role.
The irony of the Falklands Black Buck missions was that the Vulcan was originally designed for a high-level bombing mission, then crews retrained for low-level, but the only aggressive missions it flew were medium-level!