In reply to niggle: Interestingly the UK's best white runner was scottish, brought up on the powderhall proffesional handicap races. Alan Wells gold medal, shared with another white man Pietro Menea who held the 200mts record for years were the last gained in the sprints by a white man.
Also interestingly Wells started his amateur rebirth as a long jumper.
This may be of interest.
'When Bob Beamon smashed the world long jump record by almost 2ft at the 1968 Olympics, those who witnessed the feat had a memory that could never be forgotten.
Beamon nearly missed the final, fouling on his first two jumps in qualifying before getting through on his last attempt. For the next day’s final, the Welsh athlete Lynn Davies was one of the favourites. Beamon was fourth to jump. After the first three jumpers had fouled, he stood on the runway, muttering over and over to himself, “Don’t foul, don’t foul.” He was a sub-10sec athlete for 100 yards, and when he hit the take-off board, he seemed to fly into orbit. Observers estimated that he sailed 5½ to 6ft into the air, and he hit the sand so hard, he bounded straight back up and landed outside the pit.
“That’s over 28ft,” said American long-jumper Ralph Boston to Davies. “On his first jump,” replied Davies, “it can’t be.”
They moved closer to the pit to get a better view as officials slid the marker of the measuring device down its rail to the point where Beamon’s back foot had landed. Before it got there, the marker slid off its rail. It didn’t go that far. Turning to Beamon, the nearest official said, “Fantastic, fantastic.” An old-style steel tape was called for and the distance was measured twice before the result was flashed up on the electronic scoreboard. “8.90m”, which was 29ft 2½in, shattering Boston’s old mark of 27ft 4Çin.
The new world record-holder didn’t understand metric measurements and asked Boston how he had done. “Bob,” said his teammate, “you’ve jumped over 29ft.” “What do I do now?” asked Beamon. He took one more jump, which was almost 3ft short of his first, then passed on his remaining four opportunities. Davies was beaten before he started. “I can’t go on,” he said to Boston, “What is the point? We’ll all look silly.” The record went from 27 to 29ft, and a further 12 years would pass before any athlete managed to produce a 28ft jump.
Beamon’s jump may have been the most glorious feat in Olympic history. It was certainly sport’s greatest world record. There weren’t any suspicions about Beamon, and all the evidence pointed to one moment of almost freakish brilliance – that second when a great athlete produces a performance that defies rational explanation. But it is also a performance from the past that will not be repeated, because man no longer has the capacity to improve by that amount.'