Thanks Kev, although this thread is rapidly turning into the merits of phone heights (let's hope it doesn't go down the road of "mine's bigger than your's" :24:)
With regard to the vase, I can normally tell from a photo whether it's 4- or 5-in OR 7- or 8-in, although sometimes I nail it straight away. The two smallest ones give the appearance of thicker glass than the two taller ones (all vases uses the same thickness of glass), and in this case it screams 7-in to me. Apart from that, the folds are so irregular when compared to the 4-in and 5-in.
Here are two photos of the three sizes of purple Cordon that hopefully explain what I mean. Note the slight colour difference of the 4-in.