A Briton and a New Zealander have made mountaineering history by completing three-quarters of a climb up the last unconquered route of Mount Everest, their sponsors reported on Sunday.

The two climbers, Harry Taylor, 30, a former member of the British Special Air Services (SAS) and Russel Brice, a 36-year-old from New Zealand, still have to tackle the last leg of the icy, serrated northeast ridge if they are to conquer the 29,028 foot summit.Reaching the top of Mount Everest has long been regarded as the ultimate mountaineering challenge. The two climbers reported by radio on Saturday that they planned to rest before resuming their trek along the perilous narrow ridge.