What would you do if you have always considered yourself healthy and one day you find out that not only is this not the case, but you in fact need a new organ? We follow BBC journalist Mike Powell on his journey to receive a life-changing kidney transplant and talk to his donor who made it all possible.

With a growing global need for kidneys, we hear from others around the world that are on long transplant waiting lists and from Professor Elmi Muller who shares what we can do to reduce the wait time.

Presenter: Claudia Hammond