I have just had another look at the Daily Programme for 26 September 2008.
This lists as the "QE2 Fact of the Day" :
The maiden call to the town of St John's, Newfoundland was on September 9, 2005. QE2 has visited 3 times (including 2008) since 2005 making a total of 4 calls as part of her annual Autumn Colours Voyage. However in 2007 the ship could not land passengers due to weather conditions.
And so, there are two mistakes in these "facts" -- the first being that the maiden call was on 3 September 2005, not 9 September of that year. And the second that the 2008 call did not eventually take place, although it was scheduled.
I take it that the 2007 call really did not take place -- so all we need now is confirmation that the 2006 call actually happened and was therefore in reality her final call, even though nobody would have known that at the time.