Great Ormond Street Hospital is the last chance for children in the UK whose lungs are failing because of cystic fibrosis and other conditions. In a few very severe cases each year, their only hope of survival is to undergo a radical and risky step - a double lung transplant. With extraordinary access to the medical teams and the families involved for a year, this programme follows the perilous but potentially life-changing process of giving a child new lungs and a new life. Doctors only decide to list a child for transplant when they have less than two years to live with their own lungs. But new lungs - which can be rejected by the body - have a limited life span. Neither doctors nor families can know how long they will last. Children then have to live with the uncertainty of waiting for a matching donor lung to become available. As many as 25 per cent die while they are still waiting. For some lung transplant children, it is only after new lungs have arrived, that the greatest challenges begin.
Great Ormond Street was broadcast on BBC2 at Tuesday 4 August 2015, 06:14. This episode was initially placed on Tuesday 21 July 2015.