computer systems are subject on a daily basis. This matters, because our lives have become so utterly dependent on such systems. Without a proper debate, we will be left floundering when the next NatWest takes place -- and believe me, there will be another NatWest before very long. Misha Glenny's 'DarkMarket: How Hackers Became the New Mafia' is published in paperback by Vintage on July 5