Kaylee Davidson-Olley was the United Kingdom's first successful heart transplant baby when she received a replacement heart at less than one year of age. In 2017 she celebrated her 30th year after the transplant operation; it was her 30th year as the longest surviving heart transplant baby in Europe. The operation was performed by cardiothoracic surgeon, Christopher McGregor at the Freeman Hospital, Newcastle, which became one of only two UK centres performing transplants in children, and the main hospital in the UK carrying out transplants for adults born with congenital heart disease.