And then just as I was trying to get to bed, I had a loud man knock on my door and declare himself to be an Emergency Gas Engineer visiting the house because the postman and a passerby had called to report a gas leak.
It transpires that the most likely source of this leak is the pipe which brings gas into our house. That explains why people randomly think they can smell gas when they visit us, but why we've never been able to smell it inside the house. However, accessing said pipe may be problematic due to the fact that when renovating some 30 years ago, the previous owner replaced the rotten downstairs wooden floor with poured concrete. Which isn't even properly flat.
I am drenched in sweat because of being ill and I don't believe that I am likely to get any sleep anytime soon, but nor is my house likely to be exploding anytime soon since appropriate professionals are working on it. So I suppose I should count that as a plus. It's just that if I have to deal with emergencies, I'd much rather do so on days when I have ability to cope - rather than on a day when I've started with negative spoons :/