This flowchart is very useful for those wanting to understand the overall process flow:

[www.debenhamsottaway.co.uk]

However, is anyone aware of one that includes the financial agreement, specifically when it needs to be completed by?

Notice the 20 week 'cooling off' period and the 6 week delay before one can apply for decree absolute. If one or both spouses think the marriage is over and have gone as far as issuing an application for divorce one has to ask who benefits from a minimum delay of half a year. And, of course, you can't even apply for divorce within 12 months of getting married.