There have been moments when David Grimason thought this day would never come.
He started campaigning for a global arms control treaty in 2004, a year after his two-year-old son Alistair was killed during a gunfight in a restaurant in Turkey.
Now at last, an agreement is taking shape. A crucial week of UN talks begins tomorrow to set the agenda for final negotiations in July on the world's first-ever international Arms Trade Treaty.
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