I've no idea what that weird looking thing is !! Zooming in doesn't help either. Maybe it was a mock up cobbled together for an air show ? Or else the site owner might know ?
The airfield looks like Arbroath, which would also explain the Seahawk in the distance.
If so, maybe it was something cooked up by Navy apprentices, though there was no sign of anything resembling that when I spent a week there on a gliding course in 69.