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Clare Balding pays tribute to the former ÃÛÑ¿´«Ã½ racing commentator Sir Peter O'Sullevan.

An icon in the sport, O'Sullevan commentated on 50 Grand Nationals and around 14,000 races before retiring in 1997.

Speaking to Mark Pougatch, Balding said: "He was very much the professional, he knew a story when he saw it and he knew how to tell it."

"He was the soundtrack of our sport...he carried on at a level for 50 years; 50 grand nationals he commentated on. It's staggering."

This clip is from 5 live Sport on Tuesday 28 July.