The collar supports in the loft have been moved up 300 mm (that's as far as the structural engineer said we could go.) And the electrical wiring-check.
Bathroom vented through the ceiling, into the roof? Check.
In order to have more room for book shelves, we had the plasterboard put up behind the vertical supports. Uh, verdict is still out on whether it is going to look okay. But I'm glad for the extra storage room.