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Polygon
https://www.selcobw.com/300mm-hollow-soffit-board-white-x-10mm
There is a black variety which is nearly double the price but still cheap.
I have yet to actually go and look at some so it may not be suited for cladding. I suspect it's not strong enough to use without some sheathing behind it, but for my purpose it will be for weather protection only so might be ok.