Cheers bud, The basic principle was taken from http://www.xbdev.net/directx3dx/specialX/Fur/index.php but the actually implementation has been hand crafted/ported AGAL and pushed (quite brutally) into Away 4. Fortunately, the openGL wasn't that complicated so I could port the bits I needed that Away3D didn't already do.
As I'm still very much getting to grips with Away4, I've probably not implemented it in the most efficient way and I'd like to see better performance from it. Thanks again. Greg
