Adobe Photoshop CC 2015 - what I use this for (or what Lightroom can't do that Photoshop can) - footnote

One more thing. Why do I not use layers? I could and save as a PSD file so I can always go back to the file in Photoshop if needed. 

The reason I don't is that all the adjustments have been done in Lightroom, so I have all the edit work up to the point of going into Photoshop.

That is my excuse and I'm sticking to it! 

But to be fair I will have a go at using the technically correct layers process - probably be a good discipline to get into!