In reply to T45:
For a winter tent for one person under 3kg, I recommend the Vaude Power Odyssee.
It is oficially a 2 person tent, but two people in winter would find it VERY much a squeeze, even if they were small people. I only fit in when I sleep diagonally.
That said, it comes in between 2.5 and 2.8kg depending upon whether you use big winter pegs and include all the guys. It is very strong just with the two centre guys.
It is very strong in the wind, and most importantly I can set it up myself in atrocious conditions without any real faff and without any large risk of snapping a pole - external pole clips like the Jannu really help with this.
The fabric is really strong - silicon coated nylon of a similar strength to the Hillebergs.
Best of all is the price. You should be able to get a new one for £300 or less if you look around.