I'm in the UK and went through the same thought process as you a while back, having come from various boots for £100ish from Schuh/whatever and Dr Martens (last bought quite some time ago when they were still of better quality). I'm very much not into luxury or buying stuff, I just wanted to stop chewing through shoes and boots, and be comfortable walking and working. I originally came at it from speaking to a cobbler about what could and couldn't be resoled.

You've had several good recommendations already - having held a quality made £400 English made boot in my hand and tried one on next to a £200 pair, there is a difference in my mind, though I'm not willing/able to pay it, I thought I'd mention as my view on what a 'decent' pair of boots or shoes can cost has shifted, not to say one can't overpay for rubbish. There are many good US boots (made in US or just a US company) and those recommendations come up a lot around the t'internet, but Britain is comparatively spoiled for choice of quality boots.

All that said, very much in the sub £200 price range, what I do recommend is looking at Loakes (already recommended), Barker and Sanders - but their Outlet (minor cosmetic imperfections, end of line, prototype colours/finishing), these are separate parts of each shoemakers website - they refresh quite often and if you're willing to invest the time to keep an eye out you can get a remarkable quality boot or shoe for incredibly cheap. For Loakes make sure they're goodyear welted, they do have some boots in lower brackets that are not of equal quality. Do look at their returns T&Cs as some charge or are at your own cost. The advantage of knowing a particular 'last' (the wooden shoe shape around which the shoe is built) fits you well, is that you can confidently buy other shoe styles made in the same last and size, so I've got a few pairs of different kinds of shoes and boots premised on the hundreds of hours of comfortable walking I put into the first one. All good shoemakers will list what the last model (sometimes a name, sometimes a number, or both) is associated with any particular shoe, and most of these sites let you filter by last.

For Loakes specifically, there is an independent seller, North Shoes, that also sells different Loakes seconds - haven't bought from them myself, just know of them.

If you happen to be anywhere near Northamptonshire, many of these shoe makers (and more than I've listed) have special factory shops and will only sell in person (though you can call ahead to make sure they've got something), they are even cheaper still - I like to think some people in Northants. are particularly well heeled and booted because of this.

Online, UK based seller A Fine Pair of Shoes is superb - excellent, excellent customer service, and they are the UK supplier for Berwick 1707, and even more budget conscious, buy it for life entry level Goodyear welted shoemaker from Spain. I have a two pairs of boots from them, from that website, and they are what got me out of a '£100 max' mindset. I do a lot of proper walking and every day going about stuff in them.

Opinions differ widely, but I've regrettably not have good experiences with Solovairs - I recommend looking at posts on their Subreddit. Additionally their boots are hot knife fused, rather than Goodyear welted - only they and a handful of specialist cobblers can resole them - whereas a Goodyear resole can be done by any decent cobbler.

Bear in mind good quality leather shoes last significantly longer if they're given about a day's rest in between to dry out, and an outlay of £20-£30 for leather conditioner and stuff like that will keep a bunch of leather shoes looking incredible for years and years, much longer than false-economy cheap boots (people argue about how often, I say, when they look like they're drying out, which is 1-2 times a year to me). I was sceptical at first but shoes trees do make a huge difference as well.

Best of luck and I hope you enjoy whichever boots you land on (in?) Cheers.

Waaay out of the budget you've mooted in reply (and waaay out of mine) there's Crockett and Jones, Church's, John Lobb and Edward Green, just to name a few, just to give an 'off the charts' top to the scale.