lock, born in harlow, essex, joined the colchester united youth team and made his debut in 1995. he spent six years with the u's, making 102 appearances and scoring 13 goals. he had two loan spells, at chelmsford city and kettering town. he was released in 2001 and subsequently joined dagenham & redbridge, where he made 20 appearances and scored four goals. he later went on to make appearances for grays athletic.