The UK head of cyber security is to step down in 2020 after more than six years of service. Ciaran Martin, who founded the UK’s national cyber security unit, is moving to a role in the private sector for summer 2020. In response, Downing Street is going to implement a “strategic review” of British defence and security, focusing on cyber security. Martin’s top achievements include linking state-sponsored cyber attacks to Russia. In a statement, he said the time had come for a new successor to “take the organisation to the next level”.