Hi can anyone help me with this please my friend bought the plant and lost the tag. It has purple flowers and this fruit (?) has just appeared. It is not ripe yet
Never heard of or seen a greengage with a purple flower The OP refers to a 'plant' rather than a tree or bush - it would be good to have more information and perhaps a photograph of the plant
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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Not sure is it a greengage?
Never heard of or seen a greengage with a purple flower
The OP refers to a 'plant' rather than a tree or bush - it would be good to have more information and perhaps a photograph of the plant 
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Is this another pepino aka melon pear aka solanum muricatum?
http://www.gardenersworld.com/forum/plants/what-is-this-plant-please/106059.html
By jove, I think he's got it!