Knight was chosen for Australia in 1974 as the backup lock to John Callesen and Peter Whiting. But he was, even for those years, on the small side for a lock at 1.91m and his pace and athleticism clearly marked him as more a backrow specialist.
But between 1974 and 1976, Andy Leslie, as captain, had first call on the No 8 spot and Ian Kirkpatrick was always going to be preferred ahead of Knight on the flank. The best Knight could achieve in those three years was a regular place in the reserves.
A trained medical doctor, Knight moved to France soon after to play for Paris University and further his studies. He subsequently moved to South Africa, where he lived and practised medicine in Johannesburg for many years, before returning to live in Auckland in the late 1990s.
Knight's profession won him the nickname "Spock." It also meant he carried an extra burden on all his All Black tours as an unofficial medical adviser, which was perhaps unfair. In those years a fulltime doctor did not travel with international sides.
Knight had a strong family background in rugby. His father, who had also been christened Laurence, but with a spelling variation, played many games for Auckland as a forward in the 1920s and was an All Black in 1925. His brother and uncle of the younger Lawrie Knight, Arthur (better known as "Bubs"), was also an All Black and long-time Auckland representative in the 1920s and 30s.