Thanks John.
Well, on the CFS point, I was really talking about the entire Northern Hemisphere apparently not having a positive or negative height anomaly anywhere. Of course its possibe that the CFS thought the whole northern hemipshere would be "average" but I do remain quite suspicious of the CFS model. I just don't find it that stable if you know what I mean.
On past - and + NAO forecasts and how they verified, the Met Office had/has a fantastic graph going back some 20 years or more with their NAO predictions and verification included. I really, really wanted to include it in the video as I felt it would be really useful, but when I contacted the Office to try and get the link to the page they told me I'd have to pay £75+VAT for the information.
Anyway, I'd love to do more on the NAO and May SST connection (I couldn't do anymore in this video as my voice was about to give out at any moment, lol) so watch this space.