The combination was one of the few to go clear in the final jumping phase, and they finished with a score of 37.29, ahead of Nicola Wilson and Opposition Buzz with 38.76.
Andrew Nicholson was just pipped for the top prize in the other advanced class at the British fixture, finishing second by only .32 of a penalty on Nereo.
Topping the class was Beanie Sturgis on Lebowski, who added a dropped jumping rail and 4 cross-country time faults to finish with 36.57.
Nicholson and Nereo ended with 36.89, ahead of compatriot Mark Todd and Oloa with 42.93. Selina Milnes in fourth on Bodidily with 44.61 broke up the Kiwi party, with Caroline Powell fifth on Onwards and Upwards with 48.
In other placings, Tim Price won an open intermediate class with Zibor, and Caroline Powell was fourth on Halltown Harley; Andrew Nicholson was second in an intermediate section with Ulises, with Annabel Wigley and Cotswold third, and Mark Todd and MK San Cero fifth; and Todd was third in another intermediate with Clone Rocket.