I may have discovered a bit of a bug in the software, but have only seen it once so it might need more investigation. I have the bathroom set to 21C from 15C at 1900 for the children’s bath time. Optimisation is turned on so it usually comes on at about 1700 to be up to temperature on time and works well for this zone.

Last night, we were out until about 1800. I use IFTTT to set the Economy Quick Action when we are out, so it cancelled the quick action as we approached the house. However, because it was cancelled when the optimisation period should already have started, the bathroom did not come on. I noticed this at about 1830 and manually overrode it to 21C, but clearly the room wasn't up to temperature in time.