BTW - users coming from Bing search results that carry that referrer will see your site without images. I doubt this is what you want.
Nope, the landing page is referred by bing not the images.
@ matrix_jan - Ah yes :) I was looking at hits from the bot itself.
I don't block the bots either. Instead I'm in discussions with both of them as to why they are not supporting the X-Robots-Tag: noindex header. And I also have anti-hot-linking that switches the file to an advert for my site which is showing in both Google & Bing Image results when you click-through to the larger image. But I don't think this tactic recovers the lost traffic.