Hi Jason - just to say that it ended up being quite a simple fix in the CSS for the Nivo Slider.
Just had to change:
So between that and the WA resizing, its doing the job correctly:
Obviously the two banner images are a bit extreme, but the main thing is they automatically fit the space they need to.
The idea is that tour operators will be able to log in and add itineraries themselves, to fill that template page. So I don't think there's much more we can do other than advise them of how it works, and the size the images need to be.
But that's a good bit of progress today - getting the user groups and these images all working , so thanks again for your help along the way.