Liverpool, Man Utd, Arsenal, Tottenham and Everton are the only ever present sides in the top flight since the advent of the playoffs in 1987 and, for obvious reasons, have never been involved in any of the playoffs. Salford City were promoted to the football league last season and have also never been involved in the Championship/League 1/League 2 playoffs.
How many other current league sides across all 4 divisions have never taken part in the playoffs?