In which year was the first substitute used in the English Football League?

Keith Peacock (born 2 May 1945) is an English former footballer and manager. He played his entire professional career for Charlton Athletic, making over 500 Football League appearances between 1962 and 1979. On 21 August 1965, while playing for Charlton, he became the first substitute ever to be used in the Football League when he replaced injured goalkeeper Mike Rose after 11 minutes of an away match against Bolton Wanderers.

He played for the Columbus Magic of the ASL before joining his old friend Gordon Jago as his assistant manager and player at the Tampa Bay Rowdies in the North American Soccer League until 1982. Peacock's last appearance as a player for the Rowdies was during the 1980–81 indoor season.

Peacock was manager of Gillingham between 1981 and 1987 and then Maidstone United between 1989 and 1991. He later served as assistant manager at Charlton Athletic before stepping down after the resignation of Alan Curbishley in 2006. He moved to West Ham United where he became first a scout and then assistant manager under Alan Pardew and Alan Curbishley. He ended this role at the end of the 2006–07 season. In September 2007 Peacock returned to Charlton in the role of honorary associate director. On 4 January 2011 Peacock was appointed caretaker manager of Charlton following the departure of Phil Parkinson.