The Australian holds a 3.9 penalty advantage over Germany's Ingrid Klimke on Sleep Late while Britain's Ruth Edge lies third on Two Thyme.

Terry Boon, on Foreign Exchange, and Oliver Townend, on Flint Curtis, are the other top Britons in the line-up.

But William Fox-Pitt, on Ballincoola in 17th, is 14.2 penalties, or less than one refusal, away from the lead.