An update on this job:

All the main lighting and receptacle circuits in the main part of the house are done now, except for installing half a dozen or so light fixtures when the owner has decided what types are wanted. (And two I installed have to be changed!)

Pulling new cables from the main distribution panel up to the void between the floors proved an interesting exercise, as the room above is now a bathroom. Guess where the new bath had been installed? Yep, right across the floorboards over the point where all the cables emerge from the wall and turn! Had to remove the tub to get at it all (I'm sure glad the plumber had fitted individual shut-off valves on the hot and cold to the tub faucets).

Still have all the wiring to the rear extension to tackle yet, and that's going to be the new kitchen. That part has a solid concrete floor though, so everything will have to be routed up into the bathroom floor, along a hallway, under a bedroom, and into the roof void of the extension. Not sure whether I'll just use a sub-panel yet.

By the way, apparently the owner had somebody else in a few months ago to add some lighting and receptacles, got fed up with the length of time he was taking to do everything (among other problems) and threw him out. I've uncovered some of his work -- I'm not impressed.