A pretty and remote feeling run, with two rapids of note and a monster of a drop at the takeout. Inspection/portage up the steep bank on river right.
Lots of water is needed, but if you're on a Lakes trip, this might be a good option if the forecast has told you that there's been rain in the borders as the catchment is to the north.
Drive past the put-in for the Crammel Linn section, and continue on up to Butterburn. The takeout above Crammel Linn requires a walk downstream and away from the river, following the footpath to your waiting car.