I recently returned from a trip to  the river Tay where I fished on the Taymount beat..Four fish in three days was my return all coming on a Guideline 4 D floating body with a sink 1/3 tip. This combination has been lethal through out the last few summers for me, the line is very versatile and is my go to line for 95%  of my Salmon fishing. Check them out at www.guidelineflyfish.com