
Success.
I added menu items to my mainmenu to match the article links I manually coded in my slider menu image articles. This gives the Item id of the menu item that also exists now in the mainmenu.
Couldn't have figured the next bit without Firebug, fantastic tool. It's like an oscilloscope for those electronically minded.
The generated code Firebug showed when inspecting the (visible at this stage) mainmenu items looked like this, as an item example...
<ul class="menu">
......... bla bla prev item
<li class="item54">
<a href="/index.php?option=com_content&view=article&id=53
&Itemid=54">
<span>Trips</span>
</a>
</li>
........ bla bla next item
</ul>
The key discovery was the addition of the Itemid=54 to the link string, this is the id of the required menu item I added to the mainmenu. Incidentally, the id=54 is coincidental and not sequential to the article id=53, just happened to be the next menu id given out.
So back to my image slider menu html code. I now added the above menu item id I now have.
<a href="index.php?option=com_content&view=article&id=53
&Itemid=54"><img src="images/stories/photos/trips-menubox.jpg" border="0" alt="trips" title="Trips" width="250" height="200" align="left" /></a>
Now my slider image menu works just like the mainmenu, with the breadcrumbs showing up.
Last thing was to hide the mainmenu again and just show the image slider menu. I found a way of doing this, whilst still having the mainmenu enabled, was to rename the position value in the templates index.php (using JA-Purity) to something different than in the module manager.
<jdoc:include type="modules" name="hor-nav" /> renamed from "hornav"
A bit crude, but it worked for me.
Hope this may be of some help to others.
Once again, thanks to Niels for being the catalyst to my solution.
Malc