Our Coast: Dumfries and Galloway/South Ayrshire

Adrian Chiles and Mehreen Baig explore the south-western coastline of Scotland, with Mehreen taking to the skies with former RAF fighter pilot Archie Liggat, who is now using his skills to document large-scale pollution hidden along the coastline. Adrian, meanwhiile, visits Portpatrick to meet Calum Currie, who has persuaded his community to buy shares in the town's harbour - revitalising it for all who live there. Plus, Patrick Aryee joins volunteers help to track rare birdlife on the Ailsa Craig and Joe Lindsay visits an artists' colony that was the setting for cult film The Wicker Man