On Tuesday, I’ll be joining a Westminster protest for the first time in my life. Yes, me—a man more comfortable behind a laptop than in front of a megaphone, who once thought the height of rural activism was separating the recycling correctly. But something has stirred me into action: the plight of British farmers under proposed changes to inheritance tax. Now, I’m not a farmer. But for five years, I lived in Little Brington, a...