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So here's a PoD: Powell never makes his Rivers of Blood speech. As a result he is able to build up a more significant presence in the Conservative Party without being shunted away by the leadership. The Tories win the 1970 election, and Powell leads party opposition to joining Europe and succeeds in rallying them and the Labour left to the common cause. Harold Wilson eventually becomes PM again much like in our time and avoids antagonising the left by also avoiding membership. Thatcher choose not to join either. From that point onwards it's all butterflies, but generally speaking how might this chain of events have impacted Britain over the following years (including immediately post-1972)?