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STROUD, UNITED KINGDOM - SEPTEMBER 10: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Mia Tindall attends day 3 of the Whatley Manor Horse Trials at Gatcombe Park on September 10, 2017 in Stroud, England. (Photo by Max Mumby/Indigo/Getty Images)

STROUD, UNITED KINGDOM - SEPTEMBER 10: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Mia Tindall attends day 3 of the Whatley Manor Horse Trials at Gatcombe Park on September 10, 2017 in Stroud, England. (Photo by Max Mumby/Indigo/Getty Images)