The pair own shares in Subway Surf, who won impressively on her first start under Rules at Ludlow.
The five-year-old mare, who cost £35,000, was a point-to-point winner before joining the stable of Gloucestershire-based Kim Bailey.
The daughter of Milan travelled strongly throughout under jockey David Bass before quickening clear in the straight to win easily in a mares' bumper.
Vorderman, 58, and former Top Gear host Hammond are part of the Surf On The Turf partnership that owns the mare.
Vorderman tweeted her delight just minutes after the 11-4 favourite Subway Surf crossed the winning line in front.
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