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Agree with everything although I understood a 301 gives a very slight shave off the optimum link value, but the benefits in terms of user experience and keyworded URLs outweigh that.

I'm a fan of Fiddler for watching header responses.

You could also use Fiddler which a great tool for checking all the header responses per URL.

Agree with comments about Alexa.

So external  links (pretending these are the only links) on the page

link 1 example.com/spam1.html

link 2 example.com/spam2.html

link 3 example.com/spam3.html

link 4 example.com/spam4.html

link 5 example.com/spam5.html

would not pass 100% link juice surely?  Google would pick this up as unnatural and weaken them?

Hi,

the main focus of my question is to add a bit more information to my client as to where they are going wrong.

Firstly they have a directory on a third party domain with subdirectories containing all their product listings.  All the links need to be no-follow for sure.

However, from a link juice passing perspective if there are per page say 20-30 links to varying URLs on the same domain is it still the same sort of calculation that the link juice is sufficiently weakened that each link has little value, or because the links are to the same domain there is an extra (potential) filter going on?