I can't give you direct sales figures, but go into your local bookshops and look at the newer writers on the fantasy/SF shelves. I've lposted this list of the major UK debuts from 2006 before, but here it is again:
GOLLANCZ
THE BLADE ITSELF - JOE ABERCROMBIE. Dark and witty with a background reminiscent of the recent fantasy bestsellers from Steven Erikson. Featuring cowardly officers, cynical but fascinating torturers and a magi who may be a fake.
THE LIES OF LOCKE LAMORA – SCOTT LYNCH. Set in an analogue of Italy around the fifteenth century, with a protagonist who might be called a mixture of the Artful Dodger and Oliver Twist, times 100. Wonderful background and characters, and deeply funny.
THR STORMCALLER - TOM LLOYD. Young outcast 'white-eye' is called to replace the charismatic Lord Bahl, as prophecies wind around him. Very dark. Good sense of place.
TOR UK/MACMILLAN
SCAR NIGHT - ALAN CAMPBELL. Real tour-de-force, compared to Mervyn Peake and China Mieville, but more central to the commercial fantasy genre, featuring swords and witches, for instance. But the city and land in which it's set is all-important, and wonderfully conjured. Campbell has designed the GRAND THEFT AUTO computer games.
ORBIT
THE DEVIL YOU KNOW - MIKE CAREY. First UK author to join Orbit's burgeoning 'supernatural thriller' stable (which includes Laurell K Hamilton and Kelley Armstrong). Sleazy, down-at-heel and witty. Carey wrote the graphic novels HELLBLAZER and LUCIFER, and has written for Marvel and DC over a number of years.
WINTERBIRTH - BRIAN RUCKLEY. Fantasy series being compared by the publisher with Robert Jordan and David Gemmell. Human clans, ancient races, gritty realism and wars that range across continents.
HARPERCOLLINS VOYAGER
TEMERAIRE - NAOMI NOVIK. Horatio Hornblower meets Anne McCaffrey's dragons in a fantastical Napoleonic War. Good characters, interesting plot-lines, already selling very well both sides of the Atlantic, and first in a series.
The fifth major fantasy publisher in the UK, Bantam/Corgi, didn’t publish any debuts in 2006. Remember that each of the editors will be seeing around thirty books every week, and these were the only authors they published for the first time in 2006 with a big marketing push.