HRH Prince Edward created Duke of Windsor
Document reference: PREM 1/461
A minute to the Prime Minister from Sir John Simon, the Home Secretary, 28 April 1937. It refers to the Letters Patent which deprived Mrs Simpson of the title 'Her Royal Highness', and comments,
'You are aware how strongly The King [George VI] and Queen [Elizabeth, later the Queen Mother] desire this situation to be established; I believe Queen Mary also has strong views that it should, if possible, be done.'
It also explains that,
'She would acquire it [that is, the title HRH] unless something is done about it.'