The rain in Chigwell doesn’t just fall; it settles, turning the winding lanes of the Essex outskirts into a slick, charcoal ribbon under the glow of amber streetlamps. It is 11:45 PM on a Tuesday, and the silence of the village is punctuated only by the rhythmic thrum-thrum of a diesel engine idling near the station. Inside the cab, the air smells faintly of leather polish and the...