This was something I cooked up earlier, a chart of the Imperial Parliament's seats.![]()
Palestine's flag is just a place holder (it's a flag used while it was a British Mandate), as I have no idea what that flag would be. Same for Malaysa, which already had it's own flag without being defaced by the Union Flag before WW1. Saying that, Canada IIRC still used the Union Flag before WW1, but I thought this ATL might make it use it's coat of arms as a flag earlier than in the OTL.
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United Kingdom of Great Britain
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Australia
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New Zealand
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Angola
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Mozambique
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Macau
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Canada
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India
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Ireland
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South Africa
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East Africa
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West Africa
The Ex-Portuguese colonies have their flags based on their coats of arms with the Portguese heraldry removed. Apart from Macau, which I couldn't find out much about, so took the moden day flag and removed the PRC-style stars.
I could list a lot more flags, but these are just the ones I've found or made. Otherwise this list of flags could go on and on.This site is pretty interesting, with a full list of OTL British Empire flags.