Many thanks Chanan much appreciated. I've had a look myself to see how my boards are ranking for keywords and phrases and currently they are not ranking in Google images. However I am ranking 10th for a specifc phrase and the phrase needs to reflect the name of the board. Which is fine and I am now changing the board name to reflect a better keyword phrase and see how this develops over the coming weeks.
So in summary Pinterest is showing promise I think as a tool to employ in your SEO arsenal.
David