Right - threads and threads ago we discussed the precedence thing and if I recall, for the married ones (ladies) it all comes down to whether or not they're with their husbands. On that note, I wonder if we'll see actual video of today's Nato event because it will be interesting to see if Kate comes in at the end (ie last after Queen, Charles, Camilla, Anne and Edward) rather than in her usual spot, with William, after Charles.... (or before if they're doing it in reverse order - seems to depend on event. Church events goes from least important to most important, state dinners the opposite, for example).
We did see Kate seated further away than the queen than someone random like Duke of Kent or something at one event last year, but this one will be more obvious (if we see it).