ArtistX1 wrote:I see you have the sun level at 10, so I am guessing I will need to have some light coming from the default Octane light, Will mess about and see what happens
Actally, that's the Octane Environment level/intensity (which in this case is just the HDRI). If you look closely you'll see that the Carrara atmosphere is set to "none". Carrara sky's or realistic sky's must be enabled to have a sun in the scene (or maybe you can add it through the browser?). The Sun controls for the Octane environment are alway's there - with or without a sun.
One simple trick that can really help to get your HDRI set up and oriented properly is to add a sphere to your scene and give it a chrome or polished aluminum shader (something reflective). It will help to determine exactly where the sun is in your HDRI so you can rotate it to give the proper illumination direction for your scene.