English football league system
Northern Premier League Division One North, Northern Premier League Division One South, Southern Football League Division One East, Southern Football League Division One West, Isthmian League Division One North, Isthmian League Division One South Central and Isthmian League Division One South East (level 8, running in parallel, 20 teams in each division): The champions in each division automatically win promotion. The next four teams in each division play in the playoffs. The playoff winners also win promotion. The bottom team in each division plays a level 9 runner-up club in one-off matches. The losing team from level 8 is relegated to a level 9 division. If, after promotion and relegation, the number of teams in the divisions is not equal, one or more teams move between the four divisions to make the numbers even.