A British TV sci-fi drama, perhaps a one-off or short miniseries (2 or 3 parts). BBC or ITV around 1970-80.
A foreign power, probably Soviet, has developed some kind of advanced fighter plane. Lightning fast control is achieved by hardwiring the pilot's actual brain to the plane's systems.
The plane crashes somewhere in the British countryside. Violent killings are reported. The authorities investigate and find the wreckage of the fighter with wiring ripped out. Forensic techs discover brain matter.
There follows an all-out search of the country all around to find the injured pilot who has evidently been driven insane by brain damage.
Some of the footage is seen distorted through the eyes of the deranged flyer. Hand-held camera stuff which is what I mainly remember.
I think he dies at the end.