 Williams attained the Class C Snooker Referees accreditation in 1981 and within five years, was the Senior Welsh Referee in the Home International Series.By 1991, his Refereeing Classification had twice been upgraded and he now held the Class 1 (formerly A) certificate.In 1991, the Professional tour, run by the World Professional Billiards and Snooker Association (WPBSA) opened the Professional game to an unlimited number of players thus requiring more Referees to officiate at the subsequent extra matches.