Plot: We could all do with a bit of adventure in our lives after the last few months - and what better place to find it than in our great British countryside! This week, Joe Crowley visits Box Hill in Surrey to take on its infamous zigzag cycle route – pitting himself against cycling Olympic gold medallist Joanna Rowsell Shand. And we go on an adrenalin-fuelled journey through the Countryfile archives in search of the some of the best thrills and spills in our countryside