[1][2][3] The league system was 2 points for a win and 1 point for a draw with the league champions going straight up into National Division Two and the runners up playing a playoff against the runners up from National Division Three North for the final promotion place.

The season saw an incredibly tight title race between Blackheath and Launceston.

[4] Launceston would join the London side in the 2004–05 National Division Two, making an instant return by defeating 2003–04 National Division Three North runners up Halifax in their promotion playoff in what was a very tight game played at the Yorkshire-based club.

Halifax were the northern divisions runners up and as they had a superior league record than southern runners-up, Launceston, they hosted the play-off match.

76 - 10 Westcombe Park at home to Dings Crusaders on 20 March 2004 60 - 6 Westcombe Park away to Basingstoke on 20 December 2003 80 - 25 Launceston at home to Old Colfeians on 7 February 2004 Rosslyn Park at home to Basingstoke on 11 January 2003 Launceston at home to Old Colfeians on 7 February 2004 Blackheath away to Launceston on 22 November 2003 Blackheath away to Old Colfeians on 17 April 2004 N/A - multiple teams [10][11][12][13] James O'Brien for Old Patesians at home to Old Colfeians on 27 March 2004 James O'Brien for Old Patesians at home to Old Colfeians on 27 March 2004 Simon Porter for Launceston at home to Old Colfeians on 7 February 2004 Derek Coates for Blackheath away to Launceston on 22 November 2003 Derek Coates for Blackheath away to Old Colfeians on 17 April 2004 N/A - multiple players [14][15][16][17][18]