[5] Lock was a part of the team which emerged victorious in the 1975 FA Cup Final and had made 165 appearances and scored two goals by the time he departed Upton Park in May 1978.
[1][4] He dropped down to the Second Division to join Fulham for a £60,000 fee and made 233 appearances and scored 27 goals in seven seasons at Craven Cottage.
[3][6] Lock ended his career with Fourth Division club Southend United,[1] after being signed by manager Bobby Moore on a free transfer.
[3][8][9] He was named in the senior squad for a Euro 1976 qualifier versus Portugal on 19 November 1975, but remained an unused substitute during the 1–1 draw.
[3][10] Lock began his coaching career in the Southend United youth system and remained with the club after the appointment of David Webb as manager in 1986.