Professor Williams added: "After seven months of waiting, he was getting very fed up and I think he was very relieved and grateful that after several near goes, we are finally doing it." Liver expert Professor John Summerfield, of Imperial College London, said: "It's a big operation which takes many hours. He should have a very good chance of success - around a 90 per cent chance of surviving five years. The operation itself is not that complicated - it's plumbing, joining things together.