I thought it would be fun to look at some brief history for the various playoff teams across the leagues in England. Mainly I will look at the last time each team has been in that it is trying to obtain promotion to. I am listing teams in the order that they finished the season in.
Promotion playoff to Premier League
Swansea City 1983
Cardiff City 1962
Reading 2008
Nottingham Forest 1999
Promotion playoff to The Championship
Huddersfield Town 2001
Peterborough United 2010
Milton Keynes Dons never
AFC Bournemouth never
Promotion playoff to League One
Shrewsbury Town 1992
Accrington Stanley never
Stevenage never
Torquay United 2005
Promotion play to League Two & Football League
AFC Wimbledon never
Luton Town 2009
Promotion playoff to Premier League
Swansea City 1983
Cardiff City 1962
Reading 2008
Nottingham Forest 1999
Promotion playoff to The Championship
Huddersfield Town 2001
Peterborough United 2010
Milton Keynes Dons never
AFC Bournemouth never
Promotion playoff to League One
Shrewsbury Town 1992
Accrington Stanley never
Stevenage never
Torquay United 2005
Promotion play to League Two & Football League
AFC Wimbledon never
Luton Town 2009