I must take issue with the statement that modern speeds and aircraft have negated the "see and be seen" principle outside controlled airspace. I don't want to do "touch and goes" at Heathrow but I will take responsibility for looking out for other traffic in uncontrolled airspace. As I said in an earlier post there have not been any GA/Transport mid-airs to my knowledge so the system ain't bust. By the way are modern single-engined piston GA aircraft much quicker than a 1930's Percival Gull or Miles Falcon? I don't think so and those guys managed without radio.