They've announced that the Samuel Johnson Prize for Non-Fiction goes to Into the Silence: The Great War, Mallory and the Conquest of Everest, by Wade Davis -- though they haven't yet announced that at the official site, last I checked, so see, for example, Mallory book wins Samuel Johnson Prize for Non-Fiction by Anita Singh in The Telegraph.
See also, for example, the Vintage publicity page, or get your copy at Amazon.com or Amazon.co.uk
See also, for example, the Vintage publicity page, or get your copy at Amazon.com or Amazon.co.uk