Thames Valley (European Parliament constituency)

Prior to its uniform adoption of proportional representation in 1999, the United Kingdom used first-past-the-post for the European elections in England, Scotland and Wales.

1979-1984: Beaconsfield; Chesham and Amersham; Eton and Slough; Spelthorne; Windsor and Maidenhead; Wokingham; Wycombe.

1984-1999: East Berkshire; Reading East; Reading West; Slough; Spelthorne; Windsor and Maidenhead; Wokingham.

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Boundary within South East England and London (1984-1994)
Boundary within South East England and London (1994-1999)