A redistribution of Parliamentary seats, which took effect at the 1950 United Kingdom general election made no change to the boundaries; its legislation, affecting election expenses and returning officer re-classified, the seat as a borough constituency.
In the redistribution which took effect at the February 1974 general election, the seat to the west, Ealing South, was abolished and this seat absorbed most of its area to reach the electoral quota, it having been heavily underweight in electorate. The seat in statute and statutory instrument became variously Ealing: Acton and/or simply Acton where under a heading of London Borough of Ealing. From the review effective from the election of 1983 it became Ealing Acton.
Components
1918–74: Acton M.B.[1][2] Note per the London Government Act 1963 the Metropolitan Borough ceased to exist in 1965, its functions being replaced by the larger London Borough of Ealing.
1974–83: Six wards (the old area plus the centre of the new larger borough, further west), namely:
The London Borough of Ealing wards: Central, East, Hanger Hill, Heathfield, Southfield and Springfield.[3]
The change was extension, along all of the former western edge.