It was held by the Conservative Party from 1979 until 1989, during which time it was their only seat in Wales.

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.

1984–1994: Alyn and Deeside, Caernarfon, Clwyd North West, Clwyd South West, Conwy, Delyn, Meirionnydd Nant Conwy, Montgomery, Wrexham, Ynys Mon.

1994–1999: Alyn and Deeside, Caernarfon, Clwyd North West, Clwyd South West, Conwy, Delyn, Wrexham, Ynys Mon.

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