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During the 1950s and early 1960s, the United Kingdom was working on an anti-ballistic missile system known as Violet Friend. There isn't very much information available on Violet Friend (most information is in this thread on Secret Projects Forum), but it seems that an ABM system in general would have had great promise for defending Western Europe against missile attack. NATO had a major geographic advantage against the Soviets during the Cold War, and one is that they were so close to the Soviet Union. While that does make them more vulnerable to attack by bombers and theater range ballistic missiles, those systems are much easier to defend against than the higher flying and faster intercontinental ballistic missiles.
Could there have been an opening in the 1960s for a Western European ABM system, perhaps being undertaken instead of or following the cancellation of the NATO Multilateral Force and Skybolt?