CRP5
I will ignore your sarcasm in response to my genuine enquiry.
I wasn't there and so I must assume you made a prudent decision regarding fuel.
In general terms if I see PROBs on the forecast especially relating to fog that indicates to me that the forecaster isn't sure and if he isn't then I am certainly not. I generally load an extra 30 mins on top of the FP figure for those circumstances.
I agree with BOAC's original post that extended vectors and speed control below clean speed are a problem (more so on the 737).
My experience of the US (considerable) is that the controllers will vector an aircraft many miles rather than put it into a holding pattern. Makes fuel required for the approach something of a guess.