Fitted the winter tyres to the Carlsson yesterday, then at around 11 pm realised that I hadn't added the antifreeze stuff to the washer bottle in either car. Couldn't find it, went to Tesco and bought enough (I hope) of their cheap stuff to make a difference.
Then today I went out in her car in the frost and ice. Got home and my car was still covered in frost. i checked it over and found that the frost must be a mirage.... must be, because the outside temperature, according to the SID, was 13˚C.
New sensor ordered. A day of lying on the ground trying to fix it next week, then.
Then Tyrepal told me that one of my tyres had a puncture.