Dalrymple makes a good point humorously on his Salisbury Review page:

I am travelling on a train as I write this. I have just been asked over the public address system to read the safety information so that I will know what to do in the event of an emergency evacuation. I have been asked to keep my belongings with me at all times, presumably even when I go to the lavatory, failing which they may be removed and destroyed by the British Transport Police. And I have been asked to look out for and report any suspicious behaviour to a member of the staff.

Good God! I thought. Can my journey really be as hazardous as all that?