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Thanks for your response. Yes, the fruit is ready and tastes very good - juicy and sweet. The stone comes away freely from the flesh.
Last yeat this and my Oulin's Golden Gage were stripped of young leaves by wood pigeons - hence the poor fruiting on the "Majorie's Seedling" and none on the Oulin's Golden Gage.
Is it possible that the reduced number of plums on the tree could make a difference to ripening times?