Seasoned, part of the Crown Group, will be responsible for all catering at the event, including picnics for festival goers in the palace gardens, as well as private hospitality inside the venue.
Organised by PWR Events, this year's festival will reach an audience of 3,000 and will feature a line-up including George Benson, The Beach Boys, Jamie Cullum and Jools Holland.
Jamie Wells, director of PWR Events, said: "We are delighted to join forces with Seasoned Events for the 2014 festival to create an exceptional dining experience for our festival goers, whether it is in the form of the festival picnic or the exclusive VIP package."
Colin Sayers, managing director of Seasoned Events, added: "This is a really exciting contract and the whole team are ecstatic about this festival."
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