Thanks Rowland
I shoot RAW, and don't use any in-built art filters as a rule - preferring to collect and hold as much data as I can. You can stretch a good RAW a long way - you can't do that to a JPEG. I import into Aperture and use the wonderful Silver Efex Pro 2 plugin from Nix Software. I love it. To introduce grain to an image, it uses very-high resolution scanned images of real film grain as an overlay, rather than trying to emulate it. Thansk for the kind comments!