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I have a Terra Nova Quasar, its approximately 18 years old, and I've re-taped the seams once.
They are fantastic tents, Ive used it in all sorts of amazing weather and its not budged an inch. Mines the 2 man, but have had 4 incredibly snug people in it when a pals MSR collapsed in strong wind. Obviously cant sleep with 4 but could wait out the storm in relative warm and dry.The obvious downside is it weighs more than other options.
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I have a Terra Nova Quasar, its approximately 18 years old, and I've re-taped the seams once.
They are fantastic tents, Ive used it in all sorts of amazing weather and its not budged an inch.Yes, it's a great tent. Heavy by today's standards, but there is something reassuring in a storm about the tight inner pitch and multiple crossing poles.
The X-tex fabric will result in frozen condensation on the inside on cold winter nights, at least with a double skin tent this will usually be on the tent outer: "There is one set of circumstances where no fabric will work, X-tex included, and this is in very cold conditions where the temperatures are so low that the water molecules not only condense, but freeze on the inside of the tent as well."
Source: https://www.crux.uk.com/about-x-tex-fabric
The Hilleberg Helags is one of their yellow label tents which are not designed for winter conditions. The lower part of the outer tent is scalloped to allow more air to circulate and the inner has large panels of mesh. For Scottish winter conditions I would be looking at one of their red-label tents, e.g., the Nallo2 or Nallo 2 GT, or the black -label Nammatj 2 (which I use when winter camping with 2 people), though the latter two tents may be too heavy for your requirements.
I would not underestimate the potential severity of conditions in the Scottish valleys or even by the sea in Winter. I once spent New Year in a campsite near Portree on the Isle of Skye -- the wind picked up, it dumped snow and the temperature fell to -20C . The tent we used was a Terra Nova 4-pole geodesic and at least we felt secure. These days I would be tempted to stay in a Bothy and light a fire.