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WI Harrold Wilson had kept his health and decided to stay on as Prime Minister, He was barely 60 when he retired in OTL but we later found out he had alzheimers. (not clear when that was diagnosed)
My guess is that he tell Healey not to be so pig headed about squeezing wages in 78. This could prevent the Winter of discontent
Truth to tell I still think that woman wins but I also think it would be closer.