There has not been a single day since the of WWII where there has been peace on the entire planet. That has been some form of war going on somewhere in that entire time - almost 79 years now.
So why do you think that now is any worse than other times in that period?
If you are particularly worried, see how or can be organised to look after yourself and your family self-sufficiently rather than needing Government help...can you look after yourselves for light, heat, food, water, cooking, first aid and essential medicines- initially for 3 days and then a couple of weeks? If something happens, have you a plan for what to do, where would be safe to go, what should you bring ...how would you move, on foot, by car...do you have small or older/less able folks to think about, family pets etc? What documents are essential and where are they in case you need them in a hurry? Are there any specific sentimental items that are portable that you would bring. What clothes, food, other essentials would you need to pack and move? Do you have savings and can you access them relatively easily? Have you written down, on a piece of paper or in a notebook, essential information - dates of birth/marriage etc, any allergies or medical issues in family, ALL relevant phone numbers (extended family, local services, government contacts etc) in case you lose power in your own phone and thus lose the numbers - if you have a notebook, you could use another phone to call people.
But the UK is an island off the edge of Europe and, sorry to say, no longer the world leader it once was. So there is a lower likelihood of being targeted than others such as US, China, Iran, etc. If you were to think strategically, Italy is the chair of G7 this year - so makes more sense in the heart of Europe than the UK.
There is always a danger. But there's also always a danger of being run over by a bus. Statistically possible but not terribly likely for an average person on an average day.