you will not see the correct nav while on the page type defaults, but it will work on a regular page which uses that page type. This is because the page type defaults has no children. make sense?

I understood that but I managed to sort it. I hadn't set it to "second level" and then things worked :D

thanks for a response

It can take a while to understand how the c5 autonav works and I still dont understand the display sub pages section fully,

but it goes from

Top Level = all pages at the top of the site directly below home(sometimes containing home depending on template)

Second Level = All pages Below the Top Level by Default this will be the page you are on (assuming you are on a main page)

Third Level = The third level if on the second level this will display the level below

Above - Above the Level you are on

Below - Below the Level you are on

Particular Page - Displays one level below a page of your choice.

You have it working now I see so all good, :)
But if you think of a concrete site as a top down tree, with home being level 0, and each subsequent page being a level added to that.

I spoke to soon. when you click into the subpage things the pages don't show up at all.

Totally lost what the setting should be or if I've missed a check box?

Try Display Page -> at the Second level
Sub Pages -> Relevant sub pages
Sub-Page Levels -> Display sub pages to current + 1


That will display from the second level down and include any sub pages to pages that you are on.