The important thing for me is that (in my experience) its quick and easy to pitch and strike single handed in adverse conditions and it stands up well to wet, windy conditions; if I can stay dry I can keep warm. Thanks to our joke climate, any tent will be chilly in the UK, just get a good sleeping bag. There is a groundsheet in the mesh nest which worked OK under Welsh conditions and as per my original response, having what our American cousins call a "bare earth" tent works well for me, as I can walk in and out without filling the tent with crap or getting the groundsheet wet and messed up.
I really wanted a Robens Fairbanks which has pretty much the same combination of dry (sewn in bath tub) and bare earth areas, but they are way too expensive and weigh twice as much. I also suspect that it would last twice as long, but as my camping is limited to solo trips when I can negotiate a weekend pass from the Steering Committee, the Mega Horn fits the bill.