“I’ve got a lot of self-belief and I knew exactly what I was going to do,” said Williamson. “I told Callum, I told everybody what I was going to do and I did it… I was a shadow of the man I am today [previously boxing at middleweight]. I said, boxing at 12 stone [168lbs], you’re going to see the best of me and December 20 you saw the best of me and there’s only better to come.”