It was because of what happened at Bradford and Leeds that made many clubs insert relegation wage-cut clauses. Newcastle were just plain arrogant and thought they'd never get relegated. I'd be surprised if Middlesborough didnt have a wage-drop clause. I would guess that all bar the big 4, Man City, Everton, Villa, Spurs & West Ham would now have them as the norm. Certainly my club (Sunderland) do, as they were caught out in 2003 and had to flog all their players to stay afloat.

the reason a lot of football clubs have started to introduce relegation pay cuts is due exactly to the clubs you mention eg leeds,bradford also forest newcastle and boro didnt include these measures in contracts as they believed they would never be relegated,clubs like wigan,hull,bolton,blackburn and birmingham all include these measures when signing players it is a very common practice
aj no need to start getting personal ive no doubt modus wanted a shopping centre built to make money but did the town of wigan need a shopping centre not twenty years after we had one built that has seen most of its big names defect to the grand arcade leaving it an eyesore in our town with loads of empty units
i dont have any facts to back up my theory if i did id make them available to the police but anyone out there who thinks our councillors don take back handers is deluded.
not just wigan council by the way theyre all at it

Two out of the three clubs that were relegated have sold or have been trying to sell their big earners.
West Brom simply didn't have that many to start with.
There are two things that will do for Latics; relegation and Dave Whelan walking away.
If number one comes to pass the second won't be far behind.

Third... Dave Whelan retakes control of Wigan RLFC