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 pend is distinct from a vennel or a close, as it has rooms directly above it, whereas vennels and closes tend not to be covered over and are typically passageways between separate buildings. However a 'close' also means a common entry to multi-dwelling tenement properties in Scotland.