Which tie?

Last exam for James today - it was 'good' and he is now willing to think about his Leavers Prom and what to wear on Thursday night.  Turns out the suit he wore two years ago for his LVC Leavers Prom is a little snug, but we have left it rather late to go shopping...

So we (especially me) have spent a very happy hour rifling through Martin's wardrobe.  We've found a never-been-worn Charles Tyrwhitt suit which fits and some suitable shirts.  But which tie?

What do you think?