21:22

A very gracious Michael Johnson on the man who has just beaten his longstanding world record with a run that still has this stadium abuzz.

“It was great to see as a fan of the sport. People ask me all the time how long my record is going to last. You never know. It’s always a joy and a surprise to see a world record. This atmosphere needed it, to get this championship really going. He was under tremendous pressure and I think that helped him as well, knowing that LeShawn Merritt and Kirani James were going to put him under pressure,” he said on the BBC.