The reason is I want to make use of the css layout I've already made with a views slideshow, and I would like to duplicate it with another view of just one item.
I have found this question, which is answered linking to these places about arguments.
I worked it out in the end. Although I did have trouble to begin with because I got all the settings correct and it still didn't work. But on creating a new view with the same settings it worked. It might have been due to the url having several 'layers' to it.
- Sort out your page
- add 'contextual filter'
- I did a taxonimy term.
- test out in preview panel.