i.d.help requested with a micro moth please!

Before getting to the real subject of this post can anyone tell me why, despite owning almost a whole thicket of guides, I still find it virtually impossible to identify a moth with which I am unfamiliar? Could I just be distinguishing feature blind, or simply stupid?

You may have guessed by now that I have failed in another attempt to identify an unfamiliar moth.

I found this one resting on brickwork next to a Clematis in early evening sunlight.

Length as pictured, and therefore forewing length was (very approximately) 10mm.

Help appreciated...

Regards

Dave