This data is all stuff that's available from the census data producers (ONS, NISRA, National Records of Scotland) so I'd assume it will probably exist in APIs too. ONS call current constituencies "post-2019 Westminster Parliamentary Constituencies", for info!
Thanks, ONS naming conventions hurt my brain, particularly surrounding geographies. Just realised the call to the parliament members API has stopped working. I should have written integration tests, awks
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https://philmanwithbeard.github.io/we-are-many/renting/