Furthermore, Lamont helped the side to an historic victory for Scotland against the hopeful Grand Slam winners (France) in Scotland's Six Nations stunning 20–16 victory on 5 February 2006 by scoring two tries, one of which he joined a maul and used his strength and power to bundle over the line and take the Scots to victory. On 26 February 2006, he played a major part in the Scotland squad's victory over England to win the Calcutta Cup by 18–12.