As Ethan says (agreeing you MUST get all 4 replaced if you wish to change tyre type), what tyres you need will depend on where you live in the UK as much as how often you use the car and for what purpose.
As a general guide, all-season tyres will be more expensive than standard (i.e. not high performance) summer tyres, roughly about 10-20% more for the most common (often cheapest) tyres size combinations like 195/65R15 or 205/55R16, but for less common size combos, they can be near to 30-40% more expensive.
The upside is obviously you get a degree of reasonable snow/ice performance as well as better cold weather performance compared to summer tyres, but they aren't as good as summer tyres the rest of the year. Some are particularly good in the wet even compared to summer tyres in warmer weather.
Some A/S tyres are more 'summer biased', i.e. much more suited to the weather of the South of England, some are 'intermediate, suited to the Midlands to North of England for the most part, and some are more 'winter biased', suited to Scotland and Northern continental Europe.
The most popular all-season tyres are:
Michellin CrossClimate+ (summer biased)
Bridgestone Weather Control A005 (summer biased)
Goodyear Vector AllSeasons gen-2 or 3 (intermediate)
Continental All Season Contact (intermediate)
Other brands are available, some cheaper (though still good in winter conditions, some of them not so good on the fuel efficiency/summer handling) and some much nearer to winter tyres, but not so good in the summer (they also wear quicker in summer due to the softer compound).
Often the intermediate A/S can work fine in Scotland if the area is one that doesn't get too much snow in winter. For areas that regularly get snow and quite a bit, I'd always recommend getting either the 'winter biased' all-season tyres (if you have no room to store the set not on the car) or better still (if you do have storage space) summer + winter tyres for each season.
People living around the London area normally don't get much in the way of really cold/snowy weather, but it can happen, occasionally. It really depends on how much you depend on the car and your budget, etc.
I used to have summer tyres fitted on my Mazda3 - I live in northern Herts, so I don't get that much snow, but occasionally do and needed to be mobile for work (and for shopping, living in a rural area), so changed to the Michelin CC+ about 3 years ago.
I've found them to be excellent, with negligable differnce in non-winter performance compared to the 6yo summer tyres they replaced. Unfortunately I have yet to need to drive on snow (only a few days worth in my area over the past 3 years) since getting them changed.
All season tyre tech has improved quite a bit in the last 5 years, meaning that the performance penalty outside of the colder times of the year is far less than it used to be, and their winter performance has got a LOT nearer to that of winter tyres.
You can compare the prices of summer and all-season tyres on the various Tyre dealers (I prefer Black Circles, but others are fine), but I'd also check the TyreReviews.com website - it gives aggregated tests/reviews from motoring magazines for tyres all over Europe and user reviews/ratings as well.
The site owner, Jon, is very helpful/knowledgable (an ddoes his own tyre tests - videos on YouTube/website) and will repond to questions via the Disqus comment area below articles.
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