When Talk Talk suffered a cyber-attack and loss of customer data last October the mobile firm’s shares fell sharply. The board subsequently put the cost of the attack and remedial measures at no more than £35 million. But the shares have never properly recovered. By the end of last year and well before the recent stock market meltdown the company had seen its market capitalisation down by about a third — a loss of value of some £750 million. So what is to be done? Well, yesterday, Nurole, one of the first executive search firms to have properly embraced digital technology, ran a seminar for senior board directors to help create greater awareness of the issue.