Thank you so much again for the reply. I’ve spent another good few hours playing around but I think the solution I’m trying to resolve is slightly different as I’m using a deferred decal material which is just supposed to blend the normal texture over the top of the existing materials. This is working exactly as intended, but as I mentioned ambient occlusion seems to do absolutely nothing.
If I use the material in a way like you have kindly suggested so far, then the whites of the ambient occlusion overlay on top of my materials like I shared in my previous image.
Just not sure how to achieve what I’d like 