The boys will cycle through temperatures ranging from minus 10°C to more than 45°C. They'll climb over 4000m and descend to below sea level. They're two of the youngest people to have ever completed the journey, and 100% of the money raised will go directly to A Child Unheard.
The charity in question is a small one. Its first education centre in Uganda has already helped to improve the lives of some of Africa's most physically and psychologically vulnerable children. Charles and Will travelled to their second site in Ghana in 2015, helping the orphanage community and getting to know a number of the orphans personally. They knew they had to go back, and they knew they could do more.