Source buy backs - not trading!

I have been talking about large volumes of shares being traded on Source's physical gold ETF on May 9 2012 but it looks like it was a "buy back". I don't know what that entailed. I'll see if I can find out.

Retail gold ETF attracts 10 fold more buying than selling

As the gold price continues to fall I rather urgently need to assess my position. However some UK retail gold investors seem to be pretty clear that today presented a buying opportunity. 

The (allegedly) most popular physical gold exchange traded fund for retail investors -  the ETF Securities sterling denominated fund with the London Stock Exchange ticker PHGP -  has seen buyers spending nearly 10 times more than sellers have sold today. With £5.2 million worth of shares bought by investors compared to £650,000 worth of shares sold. (The most popular retail gold ETF? dealt with below)

(Click on images to expand them)