Countryfile marks the 100th anniversary of Roald Dahl's birth by discovering his passion for the great outdoors and how it inspired his writing. John Craven explores Great Missenden, the village where Dahl lived for much of his life. He meets the children's author Piers Torday, who is inspired by both the countryside and by Dahl himself. There is also a look back through the Countryfile archive to the times we have met others inspired by the beautiful countryside, from underwater painters to graffiti artists. Matt Baker has more news on how viewers can take part in the Countryfile Ramble for BBC Children in Need. Last year, thousands of Countryfile viewers took part, helping to raise over ú850,000 and transforming the lives of some of Britain's most disadvantaged youngsters. With a fortnight to go until the 40th-anniversary edition of the legendary One Man and His Dog sheepdog trialling competition, Adam Henson meets the English and Scottish teams hoping to win the trophy.

Anita Rani travels to Surrey to explore the revival of interest in growing hops there. She meets the brewers bringing back the county's fabled white bine hop, helps to get the hop harvest in and gets to sample an unusual brew made with fresh undried hops. She also joins Surrey Wildlife Trust, who are carrying out a survey of small mammals to see how effective wildlife corridors are. Adam Henson is hoping for the right conditions to get the last of his wheat harvest in, and John announces which photograph the public voted winner in the Countryfile Photographic Competition. Tom Heap is on the trail of one of the UK's most loved animals, the red squirrel, and finds out what can be done to halt its decline.