Needed the usual 3am pee-break last night. As I did my business I wondered why the radiator was creaking. I soon found out that the heating was on full.
Careful analysis of the programming of the app shows that the "switch-to- timer" schedule ran as usual at 6:16 pm, and the trip temperature was still 10C (and the 'stat was reading 18).
Without any logs I'm a bit at a loss to know how to find out what went wrong. And more importantly how to prevent it.
As SWMBO quite rightly noted, what if it's been doing this for a while ?
We use the "Smart Life" app across 2 devices to control the 'stat.