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Adrian Chiles, Mehreen Baig and a team of experts explore four spectacular coastlines linked by the Irish Sea and meet the people who call them home. In this episode, they visit the Merseyside coast.

Adrian and Mehreen arrive on Anglesey – the largest island in the Irish Sea - via the Menai Strait.

This episode explores the County Down coastline between Belfast and Strangford Lough, all the way along the Ards Peninsula.

Mehreen takes to the skies with a former RAF fighter pilot who is now using his flying skills to document the large-scale pollution that is hidden along the coastline