THE LISTED CO-ORDINATES ARE FALSE

(Black Caviar winning the Diamond Jubilee Stakes at Royal Ascot: photo from Yahoo!7 Sport)
That said, the ‘structure’ just over the fence at the listed co-ordinates WILL provide a clue on how to solve the puzzle.
The final location for this cache is:
South 35.5(Black Caviar).(Ajax)(Bernborough)(Northerly)
East 146.5(Phar Lap).(Kingston Town)(Sunline)(Wakeful)

(Makybe Diva and foal: picture by David Goudie/Herald Sun)
All these horses were/are outstanding thoroughbreds who have raced in different eras, who have had that special 'something' that made them all great 'AUSTRALASIAN' champions.
The cache is a 200mL Sistema container containing a logbook, pencil and room for some small swaps.
Good luck, enjoy the hunt, and the area.
