aviate1138 and GQ2.
Yes the Scott-Furlong Predator appeared at the RAF BoB show at Biggin Hill in September 1964.
ATV also did some "takes" at HSA Richmond Road, Kingston late 1964 maybe early 1965.
All of the identity markings (G-9-... ) on the many Hunter sections, front and centre fuselages, were removed at the end of one week and re-applied the following week.
The filming took place over a weekend but I do not know if any of the takes were broadcast.
Ciarain.