Each week, I have to go to London for a few days. I have a rented ground floor flat in a Victorian terrace. Unless it's going to be sub-zero, each time I go away, I turn the heating off. When I come back, the place has an acidic pungent "cat wee" type smell for the first ten minutes or so. I don't know what it is. There is no cat-flap or any way for an animal to come in. All the windows are closed. It's not the food recycling as I put that out before I leave each time.
I can live with it, but I'd like to know, what would cause a smell like this?
Happy for amusing answers as well as serious ones.
Oh, and Merry Christmas everyone, from a single 54 yo who isn't seeing family on the morrow.
…and I can't change spell to smell.