Countryfile is in Snowdonia. John Craven races a hill runner to the summit of Snowdon and meets the volunteers protecting the area's osprey. Anita Rani dons her wetsuit to discover that you don't need to be near the sea to go surfing. Joe Crowley meets the artist whose work is taking centre stage in this landscape. And it's all going down on Adam Henson's farm as spring takes hold. The EU referendum is arguably the biggest decision facing our countryside for decades. Tom Heap meets up with the leading figures from both sides of the argument and asks the prime minister and Boris Johnson why rural Britain should vote with them.