Diana's husband Adam told ITV London that the public need to stand up and say "this isn't good enough."
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A memorial service will mark the 30th anniversary of the King's Cross fire which claimed the lives of 31 people.
The athlete, who has been out injured since a motorbike crash in January, has been told he wont receive his annual £21,000 lottery funding.
Four people have died following a mid-air collision between a helicopter and a two-seater plane in Buckinghamshire.