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Silver Birch, a 33-1 shot Irish-trained horse, wins the 2007 Grand National.

Photographs of the first day of the 2007 Grand National meeting.

Get all the latest action from the Grand National weekend on Radio Merseyside.

Race-goers attending the Grand National are likely to be subjected to a series of security checks.

All you need to know about the 2007 Grand National at Aintree.