Really? 40 Seems like a lot, we went upto 3 doubles in our bedroom, 2 doubles in the other bedrooms, a double in each corner of the livingroom, and plugs in opposite corners of the study and dining rooms. Probably 23 outlets in total , or did you count doubles ar 2?
They have to test it before and after any work ao they can identify which bodges are OK and which aren’t. We has such delights as a loft extension on an RCD but no fuse, and fuse board with no RCD!
Also asked him to put an extra RCD and trip in for the garrage for a future 30A supply once I get the homebrew setup.
Regretting not putting at least one or two ethernet cables in. I’m not sure how nececary they (the only non wireless device is the TV box) are but it would have free’d up sockets from the powerline addapters.
I was going to channel and fit the boxes myself, but we were busy and TBH he did a neater job and worked far quicker than I could.