Thanks all - this was a shot I had in mind for the water challenge, but went with another because someone beat me to it with a dripping tap!
From memory, I shot around 30-40 shots of the tap, trying different settings, and missing most drops! Yes, the flash was used (although it was shot during the day) - came up with a very nice effect. Used high ISO, and then added even more grain in
PS.
Another version with colour, and full EXIF info (same shot, different effect):
http://sheepie.smugmug.com/gallery/246573/1/11354038
Regards,