The 28-year-old was chosen as the best entrant aged under 30 in the main Moët UK Sommelier of the Year competition which was won earlier this year by Jan Konetzki from Restaurant Gordon Ramsay.
Presenting Raducki with the award and a magnum of Moët & Chandon Impérial champagne earlier this week, AFWS chairman Nick Scade called the sommelier 'one to watch'.
"Stephen’s knowledge of wines is far reaching and his food and wine matching is extremely creative. He also has a boundless enthusiasm for wine and sommellerie and is totally customer-focussed," he said.
Paris-born Raducki said he had moved to England primarily to learn more about world wines and named Yohann Jousselin, a former winner of the main sommelier prize, as his biggest mentor in the profession.