MF - I notice you mention leaving the extractor fan in the bathroom broken as you can live with it for the moment.
I'd get it fixed sooner, rather than later (depending if you have other options like a window for ventilation,I guess).
Ours packed in at our old house and I procrastinated about getting it fixed. It wasn't long before there was mould on the ceiling (where there had never been any) as it was constantly damp in there.
We had a long length of ducting in the loft so had to get another centrifugal fan to replace it (~£40), but you can get an axial one for not much money if that'll do the job.
I hate these times when everything seems to financially conspire against you. Hope things stop breaking soon....
Have you considered some kind of earthing strap system in your house? You don't all wear shell suits do you, and shuffle your feet across nylon carpets??