Lammus made his debut for Nelson on 27 August 1923 in the 0–1 defeat away at Stockport County. He kept his place in the team for eight matches before being dropped following the 2–0 win against Stoke on 29 September 1923. Player-manager David Wilson subsequently played himself in the right-back position for the several matches until the arrival of Tom Lilley from Huddersfield Town in November 1923.
Nelson were relegated to the Third Division North at the end of the 1923–24 season, and Lammus was one of several players released by the club. He then moved into non-League football with Nuneaton Town and later Tunbridge Wells Rangers. By August 1932, he was playing amateur football for the New Beckton Baptist Church in West Ham. Lammus died in Southend-on-Sea, Essex, in early 1982 at the age of 83.
References
Dykes, Garth (2009). Nelson FC in the Football League. Nottingham: SoccerData. p. 49. ISBN978-1-905891-29-0.
Joyce, Michael (2004). Football League Players' Records 1888–1939. Nottingham: SoccerData. p. 151. ISBN1-899468-67-6.