Wired thermostat switching on after upgrade to ios 15.0.2

After upgrading as above on my iPhone 11 my wired thermostat has started the boiler and pump around 3pm every day, even though my schedule is set at ‘Off’ at this time.
I think there has been a Tado update recently too.
Tried deleting and adding the schedule again, but still doesn’t help.
The only way I can stop it is by dropping the slider temp to 5 degrees.
Anyone else having this problem?