Dear Editor We the undersigned have detected a recent resurgence in open letters to newspapers and would like to explore this further. How effective are they? What's the key to a good open letter? Why are so many springing up now? Yours faithfully Concerned readers Subjects as diverse as regional theatre, fiscal policy and trouble with the in-laws have all been recently tackled by open letters to newspapers. It's become a widely used tool to register disapproval, set out one's position or simply let off steam. Fifty-three MPs urged reform of drugs policy, 46 actors protested about cuts to regional...