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.
More top news
A Google executive has broken Felix Baumgartner's world record after jumping from the edge of space.
Charlene White explains her decision not to wear a poppy on screen.
Children's pocket money payouts have risen more than twice as fast as their parents' wage increases since the late 80s, research has found.