Both horses will compete on the international circuit with the Nottinghamshire-based rider
The top female jockey is to retire at the end of the season
The two-year-old was rescued by RSPCA inspectors in January
Olympic gold medallist Victoria Pendleton impressed racing fans by finishing second in her debut as an amateur jockey at Ripon
Tests are being carried out on the bodies of three horses that were found dead in a field. Police are also investigating.
Burghley Horse Trials
Get the lowdown on this fixture from Eventing magazine's horse trials guide — including what riders say about the event, plus vital statistics