In this brand new series, Kate Humble takes us on four journeys walking some of the most beautiful coast in the world.HOLYHEAD ISLANDThe first episode sees Kate walk a rugged and scenic coastline around a part of northwest Wales she has never visited before - Holy Island, on Anglesey. The island is known primarily for its harbour, at Holyhead, which for more than 200 years has served as a major seaport and ferry-link with Ireland.NORTHUMBERLANDThe second episode sees her walk a 15 mile stretch of the St Oswald's Way in Northumberland. And unlike her other walks, this one is split across two days, so Kate can enjoy a spot of star gazing.AYRSHIREThe third episode sees Kate walk a rugged and scenic route along Ayrshire's coast, the birthplace of Scotland's National Bard, poet Robert Burns. Kate's 15-mile walk will follow the Ayrshire Coastal Path south from Ayr to the coastal farming community at Dowhill, home to a unique and very Scottish potato.CONWYThe fourth episode of Kate Humble's Coastal Britain sees her walk a hilly coastline that is home to two of North Wales' most popular tourist destinations - the medieval walled town of Conwy and Victorian resorts.