The last world championship final he refereed was in 2002, when Peter Ebdon beat Stephen Hendry in a deciding frame. In total, Williams officiated 11 World finals, including part of the finals in 1975 and 1976. In 1983, Williams received a two-year suspended prison sentence, after pleading guilty to selling non-existent snooker tables worth £6,500. This led to the World Professional Billiards and Snooker Association (WPBSA) expelling him as a referee, however he later won a legal battle to be reinstated. In 2003 he sued the WPBSA for wrongful dismissal after the WPBSA contracts for referees included a mandatory retirement age of 64, at a time when Williams was 65. He had believed that he had an agreement with the WPBSA that meant he could continue to work, but his contract was terminated at the end of July 2002.