fuziduck

I’m after some advice. I currently have a Local Authority Building Notice in to move a bathroom upstairs and carry out some internal structural alterations to remove a load bearing wall. When I started this work I did not intend to do too much else to the rest of the house, however that has now changed. After stripping back the wallpaper I’ve found much of the lath & plaster to be in poor condition, so much so that I have stripped it off of the external walls and removed the laths entirely. (Building is not listed). Now that I have taken the rooms back to their shell it makes sense to upgrade the external thermal elements with replacement / new insulation, which is of a breathable design, however may not meet the BC new U Value targets as I am limited by the space I can lose in the rooms. My question is, I have not listed this work in my Building Control notice because at the time I had no intention of doing this work. As I want to progress this works asap I have started to reinstate the insulation ready for plastering. When BC come out to inspect the other structural works, are they likely to pick up on this, and will it cause a problem as they may consider that I am thermally changing the external walls and insist that I hit the renovation U Value targets? Any advice gratefully received.