Father of missing teenager says he feels useless, because he can't protect his daughter.
14-year old Shelley Pratt went missing five-weeks ago.
She's not been seen or heard from since.
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When you're trying to concentrate even the slightest sound can be a distraction.
The court heard how Roland McKoy killed his 22-month-old daughter Jahzara out of 'spite and resentment'.
Richard Deakin, the chief executive of NATS, was being grilled by MPs from the House of Commons Transport Committee.