Concerning your comment on the timeline of a Christian Coronation ceremony, as you know, the delay after Accession has grown enormously since the early 19th century: there is no longer the urgency to sanctify the King out of fear that he may be assassinated if he isn't seen to be God's Anointed.

Up until the Hanoverian period, Coronations were generally held on Sundays or religious Feast days. Now it's a question of attempting to cash in on the good weather, long days and the tourist industry. The weather may have failed in 1937 and 1953 (and it wasn't much better in 1911) but business will be booming. Depending on the season of the Accession, I would suggest between 12 and 18 months until the Coronation.