Over a pint at lunch time I casually mentioned that I might increase my thermostat setting from 19C. Everyone around the table looked at me in disbelief and announced their temps which were between 14-18C. I was really rather surprised at this as I didn't think I was being particularly profligate with my heating.
18-20 Eccles....though no heat today...cooling down after daughter's visit. She's taking beta blockers and feels the cold. 19 isn't overly high,surely?
Between 15C and 20C, I don't often have it on though. I don't do it for the money but central heating tends to give me a migraine. I'd rather stick another jumper on if I'm cold!
20C and when I get up in the morning I turn it way up to 25C there is no way I am going to be cold while I am showering. My son-in-law always grumbles at the heat but it is just about right for me. Oh, I forgot. I turn it down to 10C when I go to bed.
Only one little niggle, Eccles. Frost setting is OK if you have no condensation problems in those rooms. With doors ajar, I guess they're picking up heat from adjoining rooms.
You would have better "zoning" control if the rad valves are set individually, but no problem if it works for you. It's all a matter of experimentation. Every situation is different. :o)