Pulling his face away from an immersive 3D headset looking deep inside a patient's lung, doctor Sasha Stamenkovic recounted the final steps of an operation using robots to remove a tumour. "We've done some very, very intricate operating today," said the 60-year-old consultant thoracic surgeon. "We've saved a lot of lung, we've gone around some really, really small vessels and really small airways." He