A doctor performed heart surgery in a London pub two days after she learned the technique, saving the life of a stabbing victim as a crowd of drinkers watched. The newly qualified Doctor, Heather Clark and Dr. Alistair Mulcahy of the Helicopter Emergency Medical Service were called to the dimly lit Swan pub in east London, where they found 22-year-old Stephen Niland, who had been stabbed in the heart.“Niland’s heart had stopped and there was no choice but to carry out the operation on the pub floor”, the doctors told news media on Thursday. “The week before, one of the doctors had talked me through it as part of the intensive training you receive when you join the helicopter service,” said Clark.