And the question towns such as Hungerford and Dunblane are then forced to ask themselves is how have they been home to someone who turned out to be a killer.

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Someone else to ask to take to the toilet, work out how to use the inflight entertainment, fill in the immigration forms, order a drink and to clean up said drink when it spilled on them during turbulence.

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The best way to find out if someone has that kind of desire and commitment is to ask about times they have demonstrated it in the past.

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Because studies show that one of the most sensitive questions for detecting depression in someone is simply to ask him or her if they've been feeling very stressed out over the last couple of weeks.

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"It's possible someone may have dumped it somewhere because of the publicity so we'd ask people to keep a look out for it, " she said.

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