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.
: a secretion of profuse tears that overflow the eyelids and dampen the face. : a transparent drop of fluid or hardened fluid matter (such as resin) : to fill with tears (see 1tear) : shed tears. : to separate parts of or pull apart by force : rend. : to wound by or as if by pulling apart by force : lacerate. : to divide or disrupt by the pull of contrary forces. : damage from being torn (see 3tear) : a hole or flaw made by tearing. : the act of tearing something.