Hi Steve.
Those two Vampires are not T11's - the main external difference being the pylon for the drop tanks. The T11's drop tanks were a completely different design, as shown on the Airfix model. I think these aircraft are either ex-Swiss T55's or maybe ex-Australian T35's?
According to the VPG's Facebook page, they should be receiving the kits this week, which ties in with it being available from their online store in Feb!
The Vampire T11 kit is available on the Vampire Preservation Group's website http://www.vampirepreservation.org.uk/shop-gifts.htm and should be available later this week!