A winning gamble for the Camerons! David and Samantha enjoy winning bet on Sam’s old aide Isabel Spearman at Newbury races
- David and Samantha Cameron enjoyed a day at Newbury Racecourse today
- They backed former aide turned jockey Isabel Spearman, who won at Newbury
- The 43-year-old used to be in charge of Samantha’s diary and wardrobe
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