Hi Robert, I am going this way myself. Routing as follows,minor road to south side Dunalasatair reservoir - E5km to Crossmount - track N then E via McGregors Cave - X country to weir - E on aqueduct road to pick up B8079 past Electricity sub station. As my vetter said it is not particularly straight forward and could be slow going, however I have done it before and found it a very interesting route. Hope this helps.

If you're worried about getting across the aqueduct beyond the weir be not afeard. There is a bridge.

Many thanks indeed to those who have replied - all very useful!