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Forgive me if this is a silly question, but does this mean you would need to go and identify all the urls with extra parameters, and add canonical tag pointing to the primary url?

Coz if so, that would be an extremly labourious task, no? Some of my duplicate issues, have 50+ urls that are being counted as 'duplicates'.

There must be a better way, hence, I fear this must be a silly question...  

Hey thanks John. Yep got the subdomain stuff all sorted with MKTO, but I'm still not 100% sure about the tracking code side of things, the Google setup instructions here say the following;

Now suppose you have an online store and a 3rd-party shopping cart hosted on another domain, such as:

www.example-petstore.com
www.example-commerce-host.com/example-petstore/
Without cross domain customizations, a user who arrives your online store and then proceeds to your 3rd-party shopping cart is counted as two separate users with two separate sessions of different durations, which is not appropriate for this model.

You can, however, use cross-domain tracking to make sure that Analytics records traffic to these two sites to the same report. In web analytics, this is often called site linking. With it, a user to your online store who proceeds to your shopping cart is counted as one user—not two—and the session they started on the store is continued through to the time spent on the shopping cart.

Subdomains - You can use cross domain tracking to collect data from a primary domain, like www.example.com, and a subdomain, like www.subdomain.example.com, in a single Google Analytics account property.

From these Google instructions, it links through to how to setup cross domain tracking, which requires the minor edits to the tracking code that I posted earlier..
Your input/opinion (or anyone with experience in this area) would be greatly appreciated!!

Thank you

Can I clarify with you guys please?

According to GA ... "You need to edit the tracking code snippet for cross domain tracking to work. " An example of the edits you need to make (to the new Universal code) as follows:

Find the create line in the snippet. For a website called example-1.com, it looks like this:
_ ga('create', 'UA-XXXXXXX-Y', 'example-1.com'); Make the following changes to the snippet (the changes you need to make are in bold ):_

  ga('create', 'UA-XXXXXXX-Y', **'auto', {'allowLinker': true});   ga('require', 'linker');   ga('linker:autoLink', ['example-2.com'] );**

Remember to replace the example tracking ID (UA-XXXXXX-Y) with your own tracking ID, and replace the example secondary domain (example-2.com) with your own secondary domain name.

So amongst other setup elements, if this process isn't followed, it could quite possibly track sessions and visits incorrectly, as well as your goals.

Thats my understanding, anyone under a different impression? Or has tried it first hand and knows for sure? I'd love to have a difinative answer...

I'm having issues with zendesk and error reports here in MOZ, did you find a solution? Most of my errors are around duplicate page and content after switching Zendesk platforms.