Queens Park Rangers won their second league championship (the first being in 1907–08), but no clubs applied to join the Football League.
Luton Town, who finished second bottom of Division One were relegated to Division Two, whilst Leyton, who finished bottom, left the Southern League after 7 seasons of participation to join the South Essex League.
Walsall, who also played in the Birmingham & District League, left the Southern League, but continued to play in the Birmingham & District League.
Kettering also left the Southern League along with Cwm Albion and Chesham Town, who became a founder member of the Athenian League.
A total of 20 teams contest the division, including 18 sides from previous season and two new teams.