For the two bugs he submitted simultaneously, they both would have redirected through https://bugs.launchpad.net/ubuntu/+source/gfxboot/+filebug before reaching the page where the notification is displayed, so they'd also have identical "Referer" headers.
I am not sure how much that'd help in Ian's case.
For the two bugs he submitted simultaneously, they both would have redirected through https:/ /bugs.launchpad .net/ubuntu/ +source/ gfxboot/ +filebug before reaching the page where the notification is displayed, so they'd also have identical "Referer" headers.