Rik de Louche and Olivia Shanks complete the Great Himalaya Trail for two mental health charities. Rhys Fitzgerald got to the top of one Himalayan mountain as a warm-up for the world's highest peak.

However, in drill holes in the Ganges plain, the coarser rocks are always on the top and the finer pebbles and muds are on the bottom, showing that the Himalaya are relentlessly advancing on India.