Downcast: Zara, who has previously competed in the four-day event, sampled cakes and wine as she carefully selected the winner with fellow judge BBC Countryfile's Adam Henson
Zara Phillips dodged the rain to tuck into cake
The 35-year-old braved heavy rain showers as she helped choose the winning picnic at the Land Rover Burghley Horse Trials in Stamford, Lincolnshire.
Zara, who has previously competed in the four-day event, sampled cakes
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