The record of the National Fruit Collection, at Brogdale in Kent, describes it1:
Originated in France. Known in the early 1600s. Fruits have firm, fine, white flesh with a subacid and slightly aromatic flavour.
Sources
Violette (accession 1945 - 002), National Fruit Collection, Brogdale, Kent (Defra).
Supports: the description quoted; the use; the fruit's size, shape and colours and the flesh, from the collection's characterisation; the picking time at Brogdale (mid september); the other names.