The blonde woman in the long black coat clacked along the platform in stilettos. In one hand she pulled a shiny suitcase on wheels, in the other, a lead attached to a tiny Yorkshire Terrier with gleaming fur and a bow on its collar. It was the kind of dog you normally see carried and cooed over – something you’d expect to be called ‘Precious’ or ‘Bitsy’.

As the woman reached the open door of the train, she lifted the case aboard, stepped up a foot or so onto the carriage and yanked the dog behind her by its neck.