I used a few textures first of all, each one being ajusted in various ways and moved around in layer order and opacity just the get the right effect. I made a few duplicate layers of the original placed one on the very top and ajusted it's opacity so as to not let the textures take over to much. A third duplicate was ajusted just to bring the mask back and not make it too dark. Levels, curves and a gradient map added, the gradient map has the mode changed to soft light and opacity adjusted.
I have a little library of textures that I use from time to time, I think some shots just call for it. I don't think I've quite got it right yet but I'm slowly getting there!
Vic