It is my absolute delight to introduce to you one of my greatest heroes, Mary Wallis, and on the day of her 80th birthday! When you see Mary you see a lifetime of kindness: 40 years as a nurse at Great Ormond Street Hospital. Then she retired...and immediately set about volunteering there, which she has done for the last 14 years! Tune in now to hear what it is to devote yourself to a life of love and service.