Karn didn't sell. One sold for more than mine, but I'm guessing they bought other cards from the same guy. It's tempting to re-list, but...
I bought a full New Phyrexia Booster Box (with promo card thanks to @J_A_May)! This works out at £2.28 a pack instead of £3.59 local price so is a reasonable saving IF I pull some decent cards.
So far (16 packs) I have got:
Elesh Norn, Grand Cenobite
Vorinclex, Voice of Hunger
Sword of War and Peace (pack 15!)
Invader Parasite (x2)
Chancellor of the Tangle
Jor Kadeen, the Prevailer
Surgical Extraction from the box topper
With the stated 1/8 Mythic rare and 1/4 Foils I should have got 2 Mythic and 4 Foil so far so I'm ahead of the curve again. Not quite as good as the 3 mythic from 7 packs at the pre release (4.5% chance of that or better happening according to the binomial distribution) but increasing n smooths out the probabilities.