Interesting thread.
Can't help feeling some are being a little too dogmatic however.
Wiley, what possible advantage can there be in using up your diversion fuel when JAR fuel policy would let you use your superior judgement to remain at destination, if for example expected delay was only another five minutes?
In all cases I would have thought good decision making is the key, based on present circumstances, while remaining within the regs. Dogma is for politicians, judgement is for aircraft commanders.