Hello @MartinRayVaughan,
Please note if you select the page template with the No Header for example “Blank - Container | No Header”, “No Footer, Blank - No Container | No Header, No Footer”, “Blank - No Container | No Header, Footer”, etc then there won’t be Slider settings available in the page settings. In case you don’t want header in the page then you will have to use the silder short code in the Raw content element or Classic Revolution Slider element in the page content with the help of page builder.
To insert the slider to the page you can take any approach which is convenient to you since you have both the options available. I personally like to use the builder to insert the sider so that I can avoid page edit through the default page EDIT option.
Hope it helps
Thanks