The seat underwent a significant loss of territory at the 1945 boundary review, with the majority of the electorate forming the new constituency of Woodford.
In the 1955 and 1959 general elections, the celebrated cricket commentator and journalist John Arlott stood as the Liberal Party candidate.
Lost eastern areas, including Chipping Ongar, to Chelmsford, and northern areas, including Great Dunmow and Hatfield Broad Oak, to Saffron Walden.The House of Commons (Redistribution of Seats) Act 1944 set up Boundaries Commissions to carry out periodic reviews of the distribution of parliamentary constituencies.
The Borough of Chingford had been absorbed into the London Borough of Waltham Forest on its creation within Greater London and now formed the basis for the new constituency of Chingford within that Borough; the Urban District of Harlow, which had been created out of the Rural District of Epping, together with neighbouring parishes (now part of the merged Rural District of Epping and Ongar), formed the new constituency of Harlow; and remaining parts were included in the new constituency of Epping Forest.
A general election was finally allowed in December 1918 after the war was over; but first, Amelius Lockwood was disqualified as an MP by being raised to the peerage in 1917, necessitating a by-election.