Lamont was selected for the 1966 British Lions tour to Australia and New Zealand and played in all four internationals against New Zealand, scoring one try. He was selected by the 1967 New Zealand Rugby Almanac as one of its players of the season.
He played club rugby for Instonians.
Lamont got a lot of jerseys for playing rugby and most of which are framed in Ballyclare RFC
Lamont was a teacher at Throne Primary School, Whitewell Road, Newtownabbey, Northern Ireland between 1964 and 1970. Lamont left and took up a post as headmaster at Springhill Primary School in Belfast.