Don't want to drag this thread too far off topic but as I have a Vulcan question maybe it's sits here nicely rather than raise yet another Vulcan thread.
My question "What caused the Vulcan howl" ?
The reason I ask is that I never heard it with the shows I attended after it returned to the sky but always heard it during it's military displays and often when it was in the hold.
Best case in point one of it's last West Malling - Great Warbird Displays when it circled behind the crowd and seemed to be calling out like a lonely whale.