Racegoers should wrap up warmly and bring an umbrella today as thousands flock to Aintree for the 165th John Smith's Grand National. A northerly breeze will keep the air icy cold as 40 runners and riders compete in the world's most famous steeplechase. Racing enthusiasts should also prepare for rain, forecasters warned. "It will be pretty chilly at the Grand National today, reaching about 9C. There will be showers this afternoon with hail mixed in," Paul Mott, forecaster at MeteoGroup, the weather...