I've just watched the final episode of "The Seeds of Death", a Doctor Who story from 1976.
In the final scenes, the Doctor and Sarah Jane escape from a mansion that has been engulfed by a huge alien plant. The plant is then destroyed by an airstrike by RAF jets. I was thrilled to see a formation of RAF Phantoms bank in to start their run. In 1976 I would have expected them to have lo-vis roundels, but they all had the hi-vis ones. The only reason I can think of is that they were wearing hi-vis markings because they were part of a test programme testing a new ECM pod that could change the shape of the aircraft. This was borne out because by the time the aircraft came to fire their SNEB rockets, they all looked like Harriers!
That ECM pod must be very common because I often see the results. Apparently Charlton Heston's SBD was carrying one at the battle of Midway which made it look like an F9F.