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Churchill 1950-1951: Under Churchill leadership, the Conservatives did very well in Epping, making it under moust circumstances a safe seat. During this period, if the national vote was equal between Labour and Conservatives, the Tories would still get a 10%-11% majority in Epping.
Eden 1955: Eden's leadership did little for Conservative chances in Epping, despite a national swing to the Conservatives, tehre was a swing to Labour in Epping (probably down to Liberal intervention). If the national vote was equal between Labour and Conservatives, the Tories would get a 4% majority in Epping.
Macmillan 1959: Macmillan seemed to turn off potential Tory voters in 1959, as a less than average swing to the Conservatives shows a 'natural' sift to the left in Epping. If the national vote was equal between Labour and Conservatives, the Tories would get a 2% majority in Epping.
Wilson 1964-1970: Wilson's leadership saw a huge 'natural' shift to the left in Epping in 1964. The swing to Labour was on par with the national results in 1966, but there was 'natural' shift to the Conserrvatives in 1970 as a 'broken in' Heath revived Tory chances and regained Epping. If the national vote was equal between Labour and Conservatives, Labour would get a 4% majority in Epping in 1964 and 1966, and Labour would still get a 1% lead in 1970.