And one of his York Hall performances caught the eye of Saudi sport and showbiz supremo Turki Alalshikh.

However, he remained close to his old firm and colleagues and was invited to attend last year’s festive phaal and vindaloo.

So, when the shock phone call came, while he was driving from the party with a belly full of bhuna, he accidentally gave boxing’s very own Santa Clause the heave-ho.

“I had gone out on a work’s do and was on my way home when the call came. I had come off the tools well before then, but they had invited me out for a curry, and we were on the way from the meal about 9 pm.

"My manager, Frank Warren, was calling me, and I knew he was in Saudi Arabia for a fight that Christmas, and it seemed a bit strange.

"But I answered it, and Frank explained the opportunity. Then he passed the phone to the main man. I will never forget it because I was driving.”

Chamberlain built his work ethic and mental toughness on site. And his character-building route to mega-money shows at 96,000-seater Wembley Stadium has been gruelling and earned him every penny coming his way.

He explained: "Plastering is a challenging and physical job. You don’t clock off for breaks when the clock tells you to work, you work until your walls are all done.

“I was never interested in the party life, away from work and boxing, so I guess the hard work has just paid off."