Career
He was based originally in the Redhill area before later moving to Halstead, Kent. Alcock became a Football League linesman in 1982 at the age of twenty eight. He then spent six years at this level before progressing to full referee status.
He joined the Premier League list in 1995.
On 26 September 1998 came the incident for which his career is still most remembered. In a match between Sheffield Wednesday and Arsenal at Hillsborough, he was pushed over by home team striker Paolo Di Canio after having issued the player with a red card.
Di Canio was given an extended ban of 11 matches for his actions. Alcock continued refereeing Premier League matches without pause.
His final match in that competition being the 0–0 draw between Liverpool and Southampton at Anfield on 7 May 2000.
He returned to refereeing in the Football League, where he spent his final two seasons, retiring after the Norwich City versus Stockport County match in Division One on 21 April 2002.