Premier League of the Isles - 24 teams, with the top teams qualifying for European competitions (same setup as the EPL), and the three bottom teams relegated
Championship of the Isles - 20 teams, with the top two teams automatically promoting to the Premier League, and the next four competing in a playoff for the third promotion spot. Bottom four teams are relegated.
League One of the Isles - Two leagues, one covering England and Wales and the other Scotland and Ireland, with 20 teams each. Top two from each league are promoted to the Championship, with the bottom four from each relegated.
League Two of the Isles - Four leagues, one each for Ireland and Scotland with two covering England and Wales, with 24 teams each. Top two from each league are promoted to League One, and bottom four from each are relegated.
National Leagues of the Isles - Four leagues, one each for Ireland and Scotland with two covering England and Wales, with 16 teams each. Top four teams from each league are promoted to League Two.
In addition to the league competition, there are five cups:
FA Cup: All 244 teams in a single knock out competition.
Community Shield: A competition between the previous year's Premier League and FA Cup winners
Carabao Cup: League cup for the Premier League
Papa John's Trophy: League cup for the Championship and League One
FA Tropy: League cup for League Two and the National Leagues