Sorry, if I wasn't clear. I was saying that "Blend Type: Alpha" and "Channel: A" were unsuccessful and that I had to further tweak settings to get an acceptable result, and I was wondering whether I'd missed something in your instructions.
The eyelashes are wonky on the Mixamo site. The slight apparent offset is acceptable, however they did act as a window through the model if viewed from below. This was corrected by applying "Alpha to coverage" in Opacity.
Also, why dies a white Specular tint make the eyes black?
This model seems to be OK now, but I'm worried that other models may have similar problems but with entirely different solutions.
Again many thanks for pointing me in the right direction (I'd pretty much given up). Any other info you can give would also be appreciated.