In late May 2014, the UK Treasury released a press release ahead of a major report UK minsters were issuing on the costs of setting up an independent Scottish state. Joel Suss, Managing Editor of British Politics and Policy blog, asks Patrick Dunleavy about the way in which the Treasury used his research findings to arrive at a figure of £2.7 billion, and about his Twitter intervention raising concerns about it, which caused a furore. How did this episode come about, and does it serve to illustrate the problems of mis-communication between civil servants and researchers