Paddy McGuinness and a team of celebs head to the Alps to train for a world-first highwire walk for Stand Up To Cancer. And they'll do well to remember one key bit of advice: don't look down!

Ben Fogle and Victoria Pendleton are guided by professional mountaineer Kenton Cool, a veteran of twelve Everest summits. As they head up the mountain, into the notorious "death zone", physical exhaustion, extreme conditions and misfortune will test the pair to their limits, 65 years after Edmund Hillary and Tenzing Norgay became the first climbers known to have reached the summit. Since that day in 1953, more than 4000 people have successfully climbed Everest but nearly 300 climbers have died on her icy slopes. As Ben and Victoria begin their expedition and face their fears, they know Everest will be life-changing.

In a journey that captures the mental and physical toll of the 8,848-meter climb – which has claimed the lives of nearly 300 people – accompany Ben Fogle and Victoria Pendleton during their six-day trek to base camp, acclimatisation on Everest and final ascent to reach the summit.

Celebrities take a stroll in the great British outdoors with their faithful hound.

Well-known faces don their aprons in this charity special. Who has got what it takes to go all the way and compete for the Great Sport Relief Bake Off crown?