In April 1931 he finished unplaced in the Great Jubilee Handicap at Kempton Park Racecourse .
Diolite remained in training as a four - year - old but failed to recover his best form and recorded his only victory in a handicap race at Liverpool .
In April 1931 Diolite finished unplaced in the Great Jubilee Handicap at Kempton Park Racecourse .
Diolite remained in training as a four - year - old but failed to recover his best form and recorded his only victory in a handicap race at Liverpool .