Good morning and welcome.
In short, only change the Diverter V & PCV if you have to i.e. its failed.
The one thing I would prioitise would be the cam follower, if you have no evidence of it being changed, that would be the first thing I would do. It's one of the first things I did with mine and its an easyt DIY.
The only other thing I would suggest is the cambelt and water pump, its certainly at the age where it should have had at least 2 by now.