Conservative peer Lord Ballyedmond, who was among four people killed in a helicopter crash in Norfolk, had previously raised safety concerns with the aircraft's manufacturers.
AgustaWestland said they were investigating but that "there could be many causes" behind last night's crash.
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Primary school teacher Lewis Siddall was killed in an 'unprovoked and senseless' act of violence, family and police say.
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The vehicle is captured on CCTV crashing through the shop window and hitting a browsing customer who was lucky not to be seriously hurt.