Welcome back to Clarkson's farm. At the end of Jeremy's first year, Diddly Squat farm rewarded him with profits of ?144. And while he's mastered the art of moaning, challenges still abound. Who knew loading a trailer was more demanding than flying a gunship? That cows were more dangerous than motor-racing? Or that it's easier to get planning permission for a nuclear power station than turning an old barn into a restaurant? Life on Clarkson's farm may not always go according to plan. But not a day goes by when Jeremy can't say 'I've done a thing' and mean it…