Clarke Johnstone and Orient Express. © Rachel Smith/FEI
He is joined by his World Games team-mate Mark Todd, and the Australian Chris Burton, second on the World Cup rankings with 108 points. Burton will start three horses in the main class, including Holstein Park Leilani, who was second to Johnstone's Orient Express at Kihikihi.
Britain's Emily Baldwin, last year's Le Grand Complet winner, is back with Drivetime to defend her title. Baldwin also won the Chatsworth World Cup leg in May.
More than 20 other British riders are also taking part, as is British-based Chinese rider Alex Hua Tian.
Australia's Clayton Fredericks, who is currently ranked sixth in the HSBC FEI rankings, will ride three in the World Cup class - Bendigo, who won this year the CCI 3* of Saumur/France; Be My Guest, 5th in the CICO 3* of Fontainebleau/France; and Dunges Laurent Rose, 4th in the CCI4* at Luhmuhlen/Germany). He has three other horses in other classes, but will also be attending a course designer's clinic with Pierre Le Goupil.
Other countries represented include Belgium, Spain, Czech Republic, Italy, The Netherlands, Switzerland. and the USA.
Australia, Belgium, Bulgaria, Czech Republic, Italy, Netherlands, Spain and Switzerland will also have several representatives in the CIC1* and CIC2*.