Internationally he won 13 caps and scored five goals, and was a member of the Welsh squad for the 1958 FIFA World Cup in Sweden although he did not play during the tournament.
His stay with Newcastle was brief and he signed for Birmingham City before the end of the year, having had a loan spell in Canada with Montreal Concordia.
He returned to Northampton, helping them to promotion to the top flight before finishing his professional career with Bradford City.
Leek was born on 26 July 1935 in Ynysybwl, South Wales, where he lived next door to Birmingham City and future Welsh international footballer Don Dearson.
However, after Leek's celebrations after the semi-final victory,[6] manager Matt Gillies dropped his striker and replaced him with Hughie McIlmoyle for the final,[5] which Leicester lost 2–0 to Tottenham Hotspur.
[3] However, his stay with Newcastle was only a short one and he was loaned to Canadian side Montreal Concordia[1] before returning to the Midlands by the end of the year, with Birmingham City,[10] costing £23,000.
[11] He also scored two goals in the first leg of the club's League Cup victory against their local rivals Aston Villa in the 1963 final.
[1] The following season, he scored the club's first goal in the top division to give them a victory against West Ham United.
[4] In November 1965, Leek joined Bradford City for a club record fee of £10,000, becoming one of new chairman Stafford Heginbotham's first signings.
[15] His goals included two in the final minutes of a 1965 British Home Championship game against Scotland to give his country a 3–2 victory, which Leek said was his "favourite memory" of Cardiff.
[16] After his playing career, the family settled in Daventry, with Leek working for the Ford Motor Company before retiring in 1995.