Challenge: The best prime minister Britain (n)ever had

Callaghan goes to the country in October 1978 and wins with a 20 seat majority, Callaghan retires around mid-term 1980/81 and Healey defeats Foot for the leadership.
No SDP/Lib alliance, etc as the right of the Labour stay in the party.
 
Depends on how he deals with the Unions, and the state of the Conservatives after defeat.
How would have followed much the same path of Callaghan.
 
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