Seiland 3 SP

Nordisk officially classifies the Oppland as a 3 season. They do have the 4 season Seiland which is very nice. Also a tunnel tent but single poled can deal with up to 80mph head on and 70mph side on. That said if only looking for 1 person it is still about 3.6 kg fully kitted out.

I've got the Nordisk Seiland, got a post on my profile of a snow camp in Helvellyn. Nordisk have some sort of repair shop thing so my one came out with a manufacturing defect which they repaired at this place and so I got mine new for 240 less than normal, all because of a repaired 2mm hole in a vestibule. Very happy with mine. But all those other companies are great. Slingfin are inner pitch first, but use internal guidelines as well so are probably the most weight efficient of the group.

Pretty much all of the Hilleberg red and black label. Nallo and Soulo are classics. Nallo has more space for its weight and the GT has a wonderful vestibule. Soulo is the strongest 1 person and if you want to go overboard with the strength and camp in 70mph regularly then you can get black label version. Tarra if you want insane strength but will be heavy for one person. Unna is another good one, nice space, not as strong as a Nallo or Soulo but hardly weak, but it does like a vestibule (many unclip one corner). Terra Nova Quasar is another very strong tent, 7 crossing points in its geodesic shape so can cope with snow loading unbelievably well. But it is an inner pitch first which in rain isn't ideal. Slingfin make some good 4 season tents, the crossbow for example, contrary to common belief it isn't necessarily an inner pitch first but it is a bit of a hassle to set up the fly and then put the inner inside. But they use internal guylines as well so are stronger than the shape would suggest resulting in a spacious, relatively low weight tent. I personally have the Nordisk Seiland, more or less a Nallo GT. Slightly bigger and with better ventilation but slightly thinner fly fabric. I've had it in pretty high winds, but have seen a wind tunnel test up to 80mph with single poles. Have also used with friends a couple times and works well, lots of space in the vestibule. Tarptent Scarp is another UK classic, very strong for its weight, sorts out the space issues facing the Hilleberg Akto, just slightly bigger but makes a big difference in long nights, and the crossing poles allow it to cope with high snow loading. Also the Arcdome, very similar to the Unna, but has a vestibule, cheaper as well and comes with a 2p version. We'll see over the coming years, but looking at the design it might actually be slightly stronger than an Unna. Nortent does have strong tents, but they are a bit heavy on the marketing. The Vern is a bit well known for having some strength issues when it first came out, though looking at the Varde I can't see those in the same way (but the double door does mean that regardless of which way the wind is blowing one of the storm flaps will be in the wrong orientation). Almost anything by Samaya, but they make Hilleberg look cheap so there is that. They specialise in breathable single wall tents, and are the only manufacturer that is generally agreed to have manufacturing quality above Hilleberg. And lastly, possibly good fit, possibly not, the MLD Trailstar. When lots of people say four season here they just mean they want it strong for wind, in which case this is a large, very lightweight tent capable of performing in over 60mph. But it's design doesn't lend well to snow loading so if you will be doing lots of winter camps where it may snow heavily overnight it won't be a good option. But if all you care about is wind performance then you won't find anything as good for nearly the same weight. Tom Heaney on YouTube has some fantastic reviews of tents, buys all his tents or borrows from friends, no sponsorships. He's also the only YouTuber I have seen that holds the wind speed measure in the right place instead of walking off a few paces towards the ridge which results in higher wind speeds than what the tent faces. He has a wonderful video "the best two-person four season tent" comparing the Tarra, Quasar and Staika. And he personally loves Samaya. Really, there's lots of tents so I'd recommend choosing a type of tent, tunnel, geodesic, dome based on what you most value, be it strength, space, strength per weight. Then after choosing what type, choose the exact tent.

I understand that with Samaya, I personally like the colours, but I'm not sure if I'd like them as much in UK mountains with the muted beige we have than the alpine snow they show. Nammatj I personally haven't used, but to be honest it might be a bit overkill for the UK. The Nallo can manage ≈ 80mph with single poles, double poled it would be even higher. And if you really want you can actually buy 10mm poles for the Nallo (something you can actually do with almost all red label tents). But if you are routinely camping in those stupidly high winds the thicker fabric on the Nammatj with wear out slower, thicker so more abrasion needed to break. But that obviously comes with a weight penalty. A trade off I think not worth it for the overwhelming majority of UK campers, but as said if you enjoy storm camping it would be worth it.

X-mid is a surprisingly windy resistant tent, up to 45mph from Durstan and he says he has had reports of up to 60 mph but is a bit doubtful about the validity of those claims. There's the MLD Trailstar which is a VERY windy resistant tent for a low weight, covers a large area but its design allows for it to be set up on pretty rough ground. A simple design but low profile and numerous pegging points makes it a strong shape for wind (don't take out in snow). Nordisk has a few wind resistant 3 season designs, you can watch YT videos of wind tunnel tests on their page. I have their 4 season tent and love that. The MSR elixir and Hubba Hubba are classics but personally I'm not a fan of inner pitch first. All of that said, most strong tents are labelled as 4 season so there aren't too many "three season" tents capable of surviving very high winds.