netfleet - 5:10 am on Jan 25, 2013 (gmt 0)
Thanks for the responses. Looks like the images are all 'hotlinked' and, as I delved deeper most seem to be from scraping websites. Often in a very similar format.
There's an amazing amount of links though - seems that I have about 250 images with links to them from 700 different domains.
However I'm now thinking if these are just dodgy scraping sites on the whole, there would be no benefit in actually having a normal link... in fact could even hurt possibly?