Individual deliberations under conditions of serious deception are generally agreed to be invalidated by that deception. So political deliberations under conditions of serious deception should also be agreed to be invalidated. The UK’s referendum on membership of the EU was a flawed process of public deliberation precisely for this reason – that the public debate about the referendum involved serious deception. I raise the question what should be done about such public deceptions, and suggest a restrained form of legal remedy.