The Whithorn Way follows an ancient pilgrim route from Glasgow to Whithorn in Dumfries and Galloway. In this episode, Mark and Rachel start with a quick stop off at Renfrew to contemplate the motivation for pilgrimage in medieval times. Then they head to Paisley Cathedral to learn about the unearthing of a drain which revealed a slate containing musical notation from the 1400's. And they end up at the RSPB's Lochwinnoch Nature Reserve for a bit of wildlife watching and poetry.