In 1972, which TV commentator replaced an injured linesman at a football match between Arsenal and Liverpool?

James William Thomas Hill, OBE (22 July 1928 – 19 December 2015) was an English football professional and personality. His career included almost every role in the sport, including player, trade union leader, coach, manager, director, chairman, television executive, presenter, analyst and assistant referee.

In 1972, Arsenal were hosting Liverpool at Highbury on 16 September, when linesman Dennis Drewitt pulled a muscle and was unable to continue. FA rules state that the match could not be completed without a referee and two linesmen, so the game was in danger of being abandoned. The matchday announcer put a message over the loudspeaker asking if anyone was a qualified referee and would volunteer to run the line. Hill was a qualified referee and had been at Highbury that day as a spectator. He quickly donned a tracksuit before stepping in for the injured Drewitt.