My experience is in the video at the time stamp above - but that's just me...
V8 are one way and V6 are the other way - at least to the best of my knowledge.
BUT, as I always like to say, every vehicle is an individual because it is built with whatever was laying around on the shop floor that day.
And, I agree, the manuals are not internally consistent....
The Rover specified wrenches for the V6 are in the video with Rover part numbers and the location where I purchased them at the time - not sure if they are still available there or not.
They are large, it's hard to imagine that they are not sufficient to get it apart.
I find it amazing that these nuts are this tight because pretty much everything else I touch is frighteningly under torqued.
I bought the wrenches you specified in your video. They were available on Amazon. It turned out mine was a right hand thread. After a few whacks with a hammer on the nut, success. What I also noticed is the plastic fan blades were brittle so I decided to replace it.
I am changing the belts now that I have access. The radiator is free of all the mounting and all the hoses disconnected. The next step is to carefully extract it without disturbing the A/C hoses and condenser.
As I took out each screw and fastener, I put a piece of tape and marked where they came from and a unique number. I put a piece of tape on the vehicle matching the location and number. Since they are sequenced I will put them back in reverse order.
I bought replacement cooling hoses since they appear to all be original. Only the crossover pipes were replaced by the previous owner who had most of the work done a Land Rover dealer, with the “newer” un-seamed plastic ones you noted in your video.
It’s great having your video to refer back to. I was considering doing one as I did this work but although I have the patience to do the work, the video production requires more time and patience. What I am contemplating is trying to use AI, to create the animations and add my commentary. I’ve used this technique to prepare some teaching materials for my grandkids and I used to work in companies where we developed computerized teaching materials for schools. At the time, early 1980’s we hired Disney experienced animators to create the animations to make the learning more interesting for kids.
Perhaps, I’ll create a mechanic called Land Rover. A dog who repairs Land Rovers and after he repairs them, he chases them down the street.
Well, that’s a future project. Now back to the wrenches.
like in The Exorcist! In fact, I think Land Rovers were designed and built by people who were possessed. 
