Yacoub began the transplant programme at Harefield Hospital in 1980 with a heart transplant for Derrick Morris, who became Europe's longest surviving heart transplant recipient until his death in July 2005. Two years later, he performed a heart transplant on John McCafferty, who survived for more than 33 years, until 10 February 2016 and became recognised as the world's longest surviving heart transplant patient by the Guinness World Records in 2013, surpassing the previous Guinness World Record of 30 years, 11 months and 10 days set by an American man who died in 2009.