The 6ft 7in Florida-based Akinwande took the title relinquished by Riddick Bowe and the red carpet will be rolled out if he decides to put his crown at stake in the country of his birth.
"Henry's welcome back at any time," John Morris, the British Board of Control secretary, said. "I'd like to see him back. All credit to Henry for winning one of the major titles. He's a very good boxer, got wonderful reflexes and in entertainment value clearly he's sharpened up."
Williams, 23, had lost only once in 27 fights, but he was floored by a left jab, straight right combination before the 30-year-old Akinwande moved in after 43 seconds of the third.
"He threw lots of combinations," Akinwande said. "I set him up. I knew I could match him punch for punch."
Akinwande fought for England, went to the Seoul Olympics in 1988 and appeared in four successive ABA finals in 1986-89, winning two and losing two.