shirokazan
Veteran
...and how do you avoid Glasgow if you are travelling up the west coast...
Cut across Ayrshire and head for the Erskine Bridge. From Carlisle, I followed the cycle route that runs parallel to the A74M / M74 (the route is a B road / old A road, so good surface), then went Douglas Water > Muirkirk > Sorn > Galston > Stewarton > Caldwell > Howwood > Ranfurly > Houston > Bishopton > Erskine Bridge, if I remember correctly (looking at the map now).