I too remember many occasions when Conc was on the way back from Barbados on a Sunday night and was told of a 10-15 minute delay as is usual at that time.
"Er.. we can only accept one hold" came the reply.
"Roger, what is your diversion airfield or do you wish to declare an emerency?"
"Negative, we can only accept one hold. Standby."
After a pause, it transpires that the company frequency has been busy and we are informed that a 767 in the hold at BNN or somewhere has agreed to swap approach times with the Conc to save embarrassment. Not really in the spirit of things, I suppose, but if you are paying £X,000 for a seat you have the right to queue jump, don't you?