I'd also be surprised if ordinary household the insurance stated a minimum temp. Keeping the property frost free is something else and the TP75 when in holiday mode does that rather than always off. Default is 6C I think but can be overridden.
It's not a feature I will use here, to much thermal lag. Did go away one autumn before frosts set in and switched the heating off. Took 3 days for the place to stabilise again. Thick stone walls hold and/or absorb a lot heat.