I as an "average citizen" living in Germany care more about an idealistic notion of standing up to bullies than living in complete comfort.
I don't know about the UK, but here nobody is going to have problems putting food on the table or freezing to death this winter. [Edit: I should say, no more problems than we already have.]
My small discomfort at higher heating prices pales in comparison to the death and destruction that Russia is inflicting on Ukraine. If my small discomfort can stop that at all sooner then I am happy to face some discomfort.
I don't understand how people fail to see that our standing up for Ukraine and putting an end to this Russian war as soon as possible is also purely in our self-interests. Russia rampaging through all of Ukraine, and then Georgia, and then Kazakhstan, and then Uzbekistan, and then Finland, and then ..., and then maybe on to NATO (Poland? Balitics?) -- this is not in our interests.
"Oh, but Russia won't do that!" Yeah, that's what all the experts said about Ukraine also. No, sorry, Russia must be stopped now because Russia can no longer be trusted at all.