Well you were starting to get them too quickly Here's a clue: The supporters of the above teams were happy
Before you say it that was a pretty dumb answer. Had my head still unraveling previous question. Doh!!!
OK we've established that these sides all avoided relegation on the last day of the season, but they have some-thing very specific in common. As for the missing team; they are currently not in the Premier League. In fact they were relegated the next season and have never since returned to the top flight.
Time to put you out of your misery as to the connection, but I will give you until the morning to name the missing team. The connection is... They are the last six sides to avoid relegation from the top flight on GOAL DIFFERENCE!
Last chance to get the missing team - it can't be too difficult now. I'll give it a few hours or so for those who log on at work. Remember a previous clue: As for the missing team; they are currently not in the Premier League. In fact they were relegated the next season and have never since returned to the top flight.
How about Oxford United Devo. I remember them in Div 1 and avoiding relegation on the last day of the 84/85 season I think it was, and going down the next season I think amid the Maxwell hullabaloo?