KForry - I assume you have emailed London Visa Office asking for clarification? They're often bad at answering emails, but it's worth a try. Personally I'd try to send another set anyway, with the back stamped clearly. I can't imagine what else they'd want, unless they are still expecting photos according to the old specs for some reason.
Over a month gone since DM for me now and no COPR... I sent another email to LVO on Friday, this time with "Urgent" in the subject line. No reply yet. I don't want to bother my MP yet as I asked them for help with my co-op work permit just last week, but if I don't get the COPR this week, I may have to shoot the MP's assistant another email. So frustrating!