newbuild upnorth

scotframe didnt, which is something they said they missed, it wasn't on the list of things they did not quote if you know what I mean, so it will be something I quiz them on later but I expect they won't be able to help at this stage as I've just framed it up. the only drawing with it in any detail is the snip above, which doesn't really detail any divisions / anything special. the drawing has the plasterboard run past it but as you can imagine I need the void for first fix so can't fully plasterboard anything, I've plasterboard the wall section of it but need to leave the roof part until wired, if it were a coombed section of ceiling attic, I wouldn't be plasterboard on that part but im not sure if this follows the same logic.

At first fix stage on our self build, scotframe kit and doing what we can ourselves. the kitchen / dining / living room area is a mono pitch roof design covering approx 6 x 18m along the high side of the roof we have a services void / access crawl space designed in - for MVHR pipes / plumbing / cables etc and it also worked in well with bringing the ceiling down over the kitchen worktops area and built in pantry etc. its around 900 wide, 1200 high. my question is, since it runs almost the full length of the house, crossing living room / kitchen / utility / and then to plant room will I encounter any issues with building control re spread of fire between apartments / rooms. I look at it the same as the void at the side of a coombed ceiling but im not sure how it will be viewed by BC, its on the plans but with little details and I dont really want to raise an issue that might not exist. and also do you think the roof and wall area inside a service access area would need to be plasterboard - the coombed section of a pitched roof isn't usually? any experience / advice welcome.