Sir Peter O'Sullevan relives Grand National glories

Speaking in April 2012, Grand National commentary legend Sir Peter O'Sullevan remembers some classic memories from Aintree.

O'Sullevan, who has died aged 97, recalls famous races, including Red Rum's final victory in 1977 and the events of 1997 when an IRA bomb threat caused Aintree to be evacuated.

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