Ralph Giordano writes in "If Hitler had won the war" that he had planned to deport all men between 17 and 45 to the continent. Admittedly, that was crazy even for Hitler...
Since that did not happen in any of the countries the Nazis occupied OTL, I doubt it would happen in occupied Britain. Sauckel's men probably will recruit/kidnap Britons to be used as forced labor in the Reich like they did from all over Europe OTL, but the absence of the Western Front means there is a smaller manpower shortage, so less forced labor would be needed.