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Funerals are closure for those left behind. However, my only stipulation will be that it isn't a religious ceremony. Having been at humanist funeral recently, it was much more personal. When both my in-laws passed, the minister doing each service hadn't a clue about them. Kept calling my MIL by wrong name, I nearly shouted out in frustration. I behaved myself though.
The vicar in this case didn't have an issue with taking the service - I just felt it was unfair for the family of the deceased man to complain that the vicar didn't know him well enough, when the deceased had refused to speak to the vicar during his lifetime! You can't have it both ways!
That's a personal choice. Some people go straight to the Crem., short service and away, others have the Crem. Service then go back to eat and drink ........ in busy areas it can be about fitting it all in to a time scale