Base map of Wales - 1947

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Diolch

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Using this I've done 1917 and 1950 maps. Hope there's no mistakes.

Merthyr Parliamentary Borough was divided into two constituencies: Merthyr Tydfil and Aberdare. Merthyr covered Merthyr CB, Aberdare everything else. No, I don't understand either.

Cardiff was divided into three constituencies; I made (less than brilliant) maps of them a while back.

Swansea CB was divided into two constituencies. Can't remember the boundary offhand.

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Sounds like that is a reference to the previous set of boundaries, which would mean those included a Merthyr Parliamentary Borough (precursor of what you'd now call a Borough Constituency) that covered additional areas.

That's exactly right. The double-member Merthyr constituency that Hardie sat for from 1900 looked like this:

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Miskin Hundred and Caerphilly Hundred were both split into Higher and Lower parts.

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One very minor mistake spotted: the limestone quarrying village of Llysfaen (on the coast between Colwyn Bay and Llanddulas) was a detached part of the Caernarfonshire constituency. Which meant that it had its first Labour MP 75 years before anywhere it borders.