The August Derleth Award was established in 1972 by the British Fantasy Society and is given to the best fantasy novel of the year as voted for by it's members and presented during the annual FantasyCon event. Horror novels have been fairly prevalent within the award (as you might expect given the awards namesake).
2012 see's a slight change to the award in that the August Derleth Award will be honouring the best Horror novel of the year while a new award, the Robert Holdstock award will be presented for the best fantasy novel.
Never put off till tomorrow what you can do the day after tomorrow.