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I think that it's partly because my content is not 'blog-like' it's more like a travel guide and an events guide and some products so it might not look right to people but the drop was dramatic. By the way, I was just looking at your site. Would you be open to a guest article? I run an Israel travel site and could write about the 'real Israel'! Of course, I can link in exchange etc/whatever you like...

What I feel is that when you are adding authorship markup against the website, there is a possibility that the ranking of your website is going to get reevaluated based on the Author Rank of the profile. So, if you have set up authorship mark-up against the website, you need to make the author profile look active. Promote it with Guest posting, keep it fresh with regular updates and all. Hopefully the ranking will recover, unless the website has been affected by any other algo change otherwise.

Wow - now I feel like my idea has been blessed by a god (Lead SEO at SEOMoz).....feeling quite chuffed actually!

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It is unlikely but for some things possible especially when people are planning trips far in advance (before the info on this years events is available which can sometimes only be a few weeks in advance). You mean basically copy the content, update it, and put in a redirect? Thanks

It will make an impact. I have had authorship set up for months now and it has made a difference to click-throughs.  Basically I have more traffic now than before.  And I believe this is partly due to the photo in the SERPs. We put an authorship plugin together for WordPress as we needed to implement authorship on our own sites and client sites.  It's free - you can try it if you feel you can't or don't want to do it manually.  http://www.authorsure.com.