On 1 April 1977 the borough was enlarged by the addition of parts of the parishes of Eye and Dunsden, Kidmore End and Mapledurham, all from South Oxfordshire.
The number of councillors on Reading Borough Council was increased from 46 to 49 as a result.
The two South Oxfordshire district councillors representing much of the transferred area automatically became Reading borough councillors without needing to be re-elected, representing a new ward of Caversham Park.
After the by-election and two transfers, the balance of the council was 23 Conservatives, 13 Labour and 13 Liberals.
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