What about 4 April 2005? The first time they've had bans of an industrial manner since the great carpark dispute back in the 80's (not counting jetsmart of course).
Although I have to admit that the O/T bans were left so far open for abuse by the company, and individuals that can't bear to not work o/t for a couple of weeks for the benefit of the whole organisation that they're not really genuine anyway.