Hi Scott,
Just found a photo of a Vampire not currently on the warbird registry.
http://www.airliners.net/open.file/0760200/L/
As for the photo of the unidentified two-seat Vamp. I think that is N11924 A79-618 "Shamu". I do have some Vampire photos that John Kerr gave me to post here. Will do that this weekend, and I believe there are one or two of N11924 there!
T J