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Thanks! I'll have a read of those links too.
The EWI contractor said they could offer UPVC cills but I'm hoping Nordan can offer some nicer alu ones. It'll be 150mm of EWI plus whatever the render is on top so they'll need to be pretty big.
On the plus side the internal reveals/cills will be a good size for some plants :)
edit: the links you sent now have me wondering about the sliding door I'm going to get installed!
There will be 50mm xps insulation below the floor level down to the ground but not sure how that's going to work. This stuff feels like a minefield.
gillies
Rich_G
Ideally you want them in the insulation zone, but doing this isn't easy and you've then got to worry about temporary weatherproofing between the window and EWI installs occuring.
There are a few good threads on places like buildhub and the green building forum on this, I'm still getting my head around it personally:
https://forum.buildhub.org.uk/blogs/entry/245-fitting-of-new-windows-in-ewi-layer-using-ewi-brackets/
https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15771
If you decide that's too hard and go with the as close to the current edge as possible option with extended cills make sure they have end caps to stop water entering the insulation sideways.