The team are in Hampshire, where Matt Baker hears about a project championing the use of local wood, as more people using locally sourced timber leads to better-managed woodlands, and that means more biodiversity. John Craven hears how oysters are being reintroduced to the Solent in a bid to revive stocks. The Solent Fishery was once the largest in Europe, but oyster fishing was banned five years ago when annual harvests plummeted from 200 to 20 tonnes in five years. On the shoreline around the Solent, Ellie Harrison hears about an innovative project to study coastal erosion. She meets Sasha, who uses radio trackers placed into stones on the beach to follow their movements. Tom Heap looks at how new technology and smart machinery could put UK farmers at greater risk of cyberattack. Adam Henson and Charlotte Smith travel to the Shetland Islands to meet the third and last finalists for the Countryfile Farming Hero Award 2018.

To celebrate 65 years since Her Majesty's coronation, Countryfile, also celebrating its 30th anniversary, has been given unprecedented access to the Queen's Windsor estate. Matt Baker is at Windsor Great Park finding out about the Queen's countryside retreat and how it was as a young princess that Her Majesty first fell in love with the park. Adam Henson explores the farming history at Windsor as well as looking at the Queen's current farming methods. She has a number of breeds of livestock on the farm. Anita Rani looks at the Queen's love of horses and her passion for native British breeds. Anita meets a farmer who breeds Cleveland Bays, a breed rescued from the brink of extinction by HM the Queen. Sean Fletcher is at the Royal Welsh Show. It's a country show Princess Elizabeth first visited in 1947. John Craven meets the man in charge of a huge new planting scheme across the Great Park instigated by the Queen and the Duke of Edinburgh.