Three teams have been relegated in three consecutive seasons in the English football league.
The first team to do this was Bristol City. The Robins were relegated from the top flight at the end of the 1979-80 season, finishing 20th out of 22 and five points from safety (two points for a win). The following season they finished 21st out of 22 with only their rivals, Bristol Rovers, finishing below them. Bristol City then suffered a third consecutive relegation during the 1981-82 campaign when they finished 23rd out of 24 in the Third Division.
A couple of years later Wolverhampton Wanderers became the second English side to suffer three consecutive relegations. The West Midlands club finished rock bottom in the top flight in 1983-84, finished bottom of the Second Division the following season and finished 23rd out of 24 in the 1985-86 Third Division.
Most recently, Luton Town were relegated from the English Championship at the end of the 2006-07 season, were relegated from League One in 2007-08 (the Hatters were deducted 10 points for entering administration) and relegated from the Football League the following season after being deducted 30 points.