Our mention of the hitch-hiking Gnat in AM.3/83 has brought forth details on the Yugoslav Gnats from Peter Amos. The two Gnats were supplied for evaluation.
There were no follow-up orders but there is a family likeness to the Soko Orao/CNIAR IAR-93 design which appeared much later. In the meantime, the Yugoslav Air Force soldiered on with Thunderjets and Sabres.
One, presumably 11602, survives in open storage on the site of the Yugoslav Aviation Museum and will presumably appear therein after refurbishing. The photograph is of G-39-8.
The remaining mystery is why a Gnat was on a lorry heading towards London from the North? Chilbolton was west of London
In the background of the photograph are two Meteor T.7s used for ejector seat trials by Folland. They were modified to eject the rear seat and also had camera noses as on the Meteor PR.10.

Самолёты на фотографии: Aircrafts on the photo: Folland Gnat - ВеликобританияUnited Kingdom - 1955