Since the age of five, Thomas Higgs has spent Christmas hooked up to a dialysis machine, until a complete stranger gave him a gift that changed his life - a healthy kidney.
Tom suffered acute kidney failure resulting from the rare condition hemolytic-uremic syndrome (HUS), and after years spent in and out of hospital he became the first patient at Great Ormond Street Hospital to receive an altruistic kidney donation.
The transplant was carried out in 2011 thanks to the kidney donated by GP Roger Sutton from Portsmouth. Donors and recipients normally remain anonymous, but after exchanging letters through their transplant co-ordinators, Roger and Tom's family arranged to meet for the first time this year.
Both parties have chosen to waive the anonymity that normally surrounds a transplant, and alongside Thomas' mum Vicky, they join us today to highlight the benefit of giving an organ and saving a life.