Much depends on the point at which we decide that RP came into existence. William Gladstone, who was PM for four different terms in the late 19th century, went to Eton College yet his pronunciation gave away that he was from the North of England and his speech was criticised by RP speakers in the early 20th century.
Definition of vane. 1a : a movable device attached to an elevated object (as a spire) for showing the direction of the windb : one that is changeable or inconstant.
J. Cheney. 1  1. Vain is used as an adjective to mean: without much value or significance; excessively proud or concerned about one's own appearance, personal qualities or achievements. 2  2. Vane, a noun, most frequently refers to a device used to determine the direction of wind. 3. Vein as a noun refers to blood vessels that carry blood from various body parts to the heart. Similarly, veins also are tissues that form the principal framework of a leaf or line-markings in marble or rocks.