Metropolitan Police Commissioner Bernard Hogan-Howe wants to cut all crime. He says as far as he is concerned "all crime matters".
He added: "If we can cut all crime then we will end up with a happier and a more confidant London - a place people want to invest, people want to visit and I'm confidant we can do that in the future".
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Nick Herbert, 45, was so frustrated by his son not answering his phone that he designed an app that torments recipients until they reply.
Charlie Alliston, 20, collided with HR consultant Kim Briggs, 44, at OId Street, central London in February last year.
The weapon was found by a member of the public in bushes in Greenford.