So I took the day off. Two people (one experienced, one not so) arrived at 10:15 and worked for roughly 5 hours. The fuse box got replaced. Instead of 2 fuses I now got 4. A unearthed power socket got added to the light switch in my work room. Ditto to the switch at the entrance to the bed room. This means I no longer have to use extension cords when vacuum cleaning.
They also added a 240volt plug to the shower. No isolation transformer since apparently it is 'out of the zone' at > 1½m from the shower head. I am slightly pessimistic about this.
While doing the the apprentice also drilled though the wall, shattering the mirror on the other side of the wall. Not quite sure how you do that. A 3cm plug fits nicely in a 5cm hole. When you drill well over twice that deep some mental alarm should go off though. Apparently it did not.
The've been gone for an hour now. Up to 10 minutes ago I have been cleaning. Home looks decent again. Now a shower, a painkiller and lunch.