Hi,
I couldn't find anything on the Net for Isla Traquair's news blooper for that evening, so your only hope may be to write (not e-mail) a really nice and sweet letter to Five News or Isla herself, via the channel, and see if they'd be willing to send you out a copy of the relevant "blooper" in some format.
The only other alternative would be to find a local University near to you, and contact their Media Recordings department, as most Uni's record 24/7 of all of the five terrestrial broadcasters, and keep the recordings for a maximum of 14 days (if I recall). Again, a quick, polite phonecall, or personal visit may aid you in your quest to get this piece of footage.
Best of luck.
Pooch