Another Brit here. I'm willing to give our government the benefit of the doubt (well, not the government, who I trust as far as I could throw them: but having read their CVs and seen them speak I have time for and faith in the Chief Scientific Advisor and Chief Medical Officer that they have done their research and this is their judgement of the best course for us).
However, I think we all have to be realistic: nobody has any idea what strategy is best here. Everybody is just making assumptions, which are feeding into models, and then working on the basis of what the models tell them: but a lot of those assumptions inevitably are going to turn out to be wrong, and we can't know which ones. It could be that our "strategy" is a disaster, it could be that those who clamped down now suffer a more damaging second wave as soon as they loosen restrictions, it could be that we in the UK have a disasterous short term AND then a terrible second wave, we just don't know. I don't think there is any strategy in any country that will avoid this being a very very painful experience.
Most people I know are taking it seriously though the pubs are full when I walk home from work so not everybody is.
My parents are in their 70s/80s and my Mum is quite depressed about it. Our government has said people in risk groups may need to self-isolate for 4 months. My Dad is talking about postponing the next stage of his PhD as he won't be able to go to the document archives to research. At least it is coming to the warmer time of the year here, and they have plans to go for walks, give themselves concerts at home, garden, cook, etc. but it is a big change and a big challenge to mental health and wellbeing.
My resolution is to do some "digital closening" with elderly relatives that I don't usually manage to speak to much (because I hate the telephone!) to try to make up for some of the physical distancing that they are likely having to do. Going to call my Uncle today (asthmatic, hospitalised for pneumonia last winter, so understandably concerned), Godmother later in the week (partner died just before Christmas so feeling down anyway and this can't be helping). Dropping a note into my elderly neighbour to make sure she has my number and offer help if she needs it after work this evening.
I suspect we could all do a bit of that kind of thing, and it might be a good way to manage the anxiety and feel a bit less helpless ourselves too.
Also: it had never occurred to me I ought to be taking off my shoes every time I come in, but that is firmly on my agenda now, thanks!