Child in a million. Part 5, The Bhattacharyya brothers and Luka.

The fifth in a six-part series following the stories of children undergoing pioneering treatments for rare medical conditions at London's Great Ormond Street Hospital. This part tells the moving stories of two brothers born with virtually no sight who are awaiting a corneal transplant operation and Luka who has a malignant liver tumour, something that only one in two million children suffer from. In both cases we see detailed surgical footage.