I will reply to the site's resident middle-class pontificator.
I don't really identify as particularly isolationist in one sense of the world. I'm pro a sensible level of immigration to the country, I also love visiting foreign countries and consuming their culture.
I don't want to be part of the EU partly because I don't like the entire concept of the EU. We don't need to be under one flag and currency, Europe's strength is it's different languages, cultures, beers, cheeses, the whole concept of the EU dilutes the most interesting continent on planet earth.
There is zero need for political union to act in each others interest on defence, trade and other matters.
I am slightly isolationist in the 'generally sceptical about getting involved in foreign conflicts' sense. But that's only generally. I actually semi-agree with
@Eric Blair that maybe it's just time to properly back Ukraine.
The way I see it is there's two options with Ukraine:
1) properly back them with everything they need to actually beat Russia, push them back to the border, and win the war.
2) Negotiate for some kind of peace agreement, alongside Trumps America, it would be a horrible messy thing with parts of Ukraine gone forever like Crimea, but at least no more death.
This kind of back them just enough to stay in the fight strategy, pronlonging human tragedy doesn't seem to really make sense. Unlike many EU countries we haven't shirked our responsibility nearly as much. Germany was so reluctant to get involved as it sucked on Russia's gas-teet more than anyone.
I don't think my natural isolationism in terms of war is much different to many on here either, I doubt many of us did/would have supported the wars in Iraq or Vietnam. The governments responsibility should be focused on making the lives of British people as good as is possible, not acting as the world's arbiter.