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This episode explores the south western coastline of Scotland’s gateway to the Irish Sea. Mehreen takes to the skies with the former RAF fighter pilot who is now using his flying skills to document the large-scale pollution that is hidden along the coastline.

Meanwhile, Adrian visits the beautiful harbour of Portpatrick to meet the local hero who persuaded his community to buy shares in the town’s harbour, revitalising it for all who live there.

Other highlights include engineer Danielle George being given a rare opportunity to get hands on in one of the UK’s major air traffic control centres in Prestwick. Wildlife expert Patrick Aryee joins local volunteers to help to track rare birdlife on the stunning Ailsa Craig, and cultural connoisseur Joe Lindsay visits a renowned artists’ colony that is also the setting for The Wicker Man. Finally, Adrian and Mehreen find out the secrets of cold smoking Scottish salmon.