Thanks gazmaster, the image was taken in the cameras RAW format, so I had all the colour data available before the conversion from RAW to my PSCS2 workspace. I don't recall if I desaturated it during the conversion or after I got it into photoshop.
Many thanks for your reply, we were having a discussion the other day on whether it was best left to the camera for b&w or to manipulate it in PS, I think the jury is still out, the concensous of opinion was though that to convert it in PS is better as you have the colour image as the original. Swings and roundabouts I suppose Keep up the good work, it's refreshing to see.
Personally, if I intend to shoot specifically for a black and white image, I would rather do it with Black and White film rather than Digital (which leaves data out. But for me the Use of Polycontrast filters in the darkroom are a must for getting the contrast just right, especially when running colour negatives under the enlarger.
Haven't done it in a while, but that's my two cents worth.
For digital going to BW, just look at your histograms to see just how much of the image data you're losing every time an adjustment is made to the levels.