Allak 3

This absolutely. A red or black label hilli is the answer if price is no object. I have an allak 3 and the build on it is so far beyond any other tent I own.  Those zippers are just a joy to use. 

Sounds like a dome is perfect for you. Domes are not necessarily the best in high winds, but you do not have to take care as much about how to pitch it perfectly - unlike tunnel tents or similar constructions. If weight is not your highest priority I think a dome tent is the mostconvenient for Scotland/Scandinavia, especially in exposed locations like mountains and coastal regions. I use Hilleberg Soulo/Allak and Fjällräven. A lot of lightweight tents use a pyramid construction but they can be a bit annoying to set up - in my opinion. People swear by it but I am not convinced for my use cases (northern Europe with chance for torrential rain and wind over days).

Hilleberg Allak. I have lots of tents, most of them lighter than this, but I always choose the allak. Ventilation / no condensation is a big reason, but the list of pro's is long.

Staika is overkill for the UK. Just go with the Allak. Not a big weight saving but it will be fine for anything Scotland can throw at you.

I own a hilleberg and it’s the most competent of the winter tents I tried out. Very suited to Scotland.  Their red label tents should be acceptable for what you are looking for.  I’d also be mindful of the fact that when camping in woodland l, there can be a lot of beaches ready to come clattering down on your fragile canopy, so make sure you risk asses the area before pitching. Weeks of storm damage can be be forced to fall,  by even the lightest wind in our climate. 

Mountain 25 is a good tent used worldwide. If price is no concern then I would definitely suggest going with a Hilleberg black or red label or Mountain Hardwear Trango 2. Any of the three will definitely last a lifetime. I wouldn’t rush though, order a free hilleberg catalog online. They have some amazing tents. I’ve personally camped in a double-poled (yea you can use two poles where one goes on hilleberg) Tarra and saw winds of 80mph. Fabric whipped a bit but sleeping at that level we always bring ear plugs.

Hilleberg is solid but damn those prices hurt. If you're not doing serious mountaineering the MSR Hubba series is way more reasonable and still built like a tank