issi noho,
So you think it would have been a better plan to fly them through the London TMA, over the city or close one of the major airports you named do you. Although i stated that they probably knew it to be a hoax there is a procedure to follow, a set of SOPs. The passengers will get squat by way of compensation for this unless they sue the fool that wrote the note. The pax could have been held for much longer than they were. I am sure that the police are sorry for the inconvenience but thats as far as it goes.