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I feel itchy just looking at those photos.
They do look like they are just there to support the knee wall though. I expect @absurdbird has better insight though.
How is it ventilated, by the way?
You might start developing a damp problem if there's insufficient air flow.
@absurdbird @TW these photos might help. I’m about 99% sure these can be taking any load from the roof. I can’t see a purlin and these knee wall posts end at the roof sarkin. Based on there size I’d say these were just used as knee wall posts for previous lath and plaster walls as you can see in one of the photos.
But I have no real idea so advise/help very much appreciated.