Is the R-value of that mat really only 0.7?

That's a good question. Having looked into the range a little further, it would seem that the Ultralight is very much focussed on keeping weight to an absolute minimum (i.e. at the cost of greater insulation + warmth). As such, it'd be ideal for summer camping + trekking, but less fine if you're spending months on a glacier - it's most certainly not designed for that! If that's what you're looking for, the Ultralight Insulated, Comfort Light Insulated or even beefier Comfort Plus Insulated would be the ones to go for (R3.5, 4.2 and R5 respectively). Hope that's of help.

And where would one purchase one of these from? In the market and sure as hell can't forsee winning anything as usual.

There's three stockists listed on the product news page here: http://www.ukclimbing.com/gear/news.php?id=8600 That said, the moment you buy one you know it's inevitable that you'll win...