WI Macmillan and Gaitskell survive in '63?

How much longer could he stay on as PM? Would he win against Gaitskell in '64, and who would succeed Macmillan? Rab Butler is rather old to begin a first term (after being DPM/CoE for most of the 50s), unsure about Heath, and don't think Home would get it. How would UK politics be affected?
 
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