I confronted a large group of foul-mouthed, beer-swigging men on the train after they laughed at the guard and started blasting their music. What happened next shocked even me: CLARE FOGES

It was bliss: a table seat in a quiet train carriage, a coffee and flapjack, green fields rolling past.

And then, horror: ten young men got on acting more riotously than a gang of French football hooligans. ...