The coastal adventure continues along three strikingly different shorelines, as Helen Skelton, Jules Hudson and JB Gill divide and conquer the UK's vast coastline.

In Pembrokeshire, Jules starts his coastal mission with porpoise - joining Sea Trust Wales to help photograph these elusive marine mammals as part of vital conservation work. Back at the dock, he gets hands-on with the Recycle Mor project, discovering how discarded fishing gear is transformed into unusual, sustainable products. Then, he uncovers the astonishing story of Britain's biggest blaze since the Great Fire of London - a 1940 Luftwaffe raid on Pembroke Dock that sparked an 18-day inferno and brought nearly 600 firefighters from across the UK. The disaster left a legacy that transformed how Britain responds to emergencies.

Up on the North Tyneside coast, Helen zips up her wetsuit and takes the plunge at Tynemouth Long Sands - fast becoming the North-East's surfing hotspot. With chilly waves and a warm-hearted surf community, who needs Cornwall?! After drying off, she heads to nearby North Shields' Fish Quay, where centuries-old fishing traditions still thrive. Helen joins the bustling morning auction, chats with seasoned traders, and rounds off her visit with a fresh seafood lunch overlooking the sea.

Meanwhile, on the Norfolk coast, JB kicks things off with a fiery favourite - tracing the journey of Norfolk-grown mustard from farm to factory. He discovers how the county's salty sea air helps deliver the perfect punch for the iconic Colman's condiment. Then it's time to swap spice for sails as he heads to Burnham Overy Staithe, following in the wake of a young Horatio Nelson. With local skipper Ash showing him the ropes, JB learns that mastering a boat is a little less smooth sailing than it sounds.

And, as always, the trio stay connected - sharing discoveries, laughs and the odd bit of coastal rivalry.