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I just used a couple of "felt support trays" from selco, which looked like they would achieve the correct end result. Put it under a layer of felt underlay followed by shingles.
I too agonised about layering and order etc etc. The Internet is full of different opinions on how it should be done. Felt like there was no correct answer
Did some more shedding. Just need to make some doors now and push it in to position.