The period of mourning is 12 m
so it has to be after that
( yeah yeah OK WIlliam I, coronation almost immediate etc)
Edward VII - o god you know all this really dont you - was delayed for appendicitis. Treves took it out and I cant remember who gave ether/chloroform.
George VI - took over the date for Edw VIII
so there have been confounding influences
Edw VII delay gave rise to significant cases of precedent in Contract - for those who had hired windows to gawp out of as the King passed by