Ahem. I’m an idiot. The reason the RSS wasn’t working correctly is because the redirect command I’d put in place was also redirecting the redirection, hence the repetition of images. In my defense, I’m an architect, not a geek.
Both feeds will remain in place but if you’d like to get images as well as text from this point on you’ll need to resubscribe to the new address: rob.annable.co.uk/rss20.xml.