Letter from Conan McIlwrath, Chair, Haemophilia Society, Andrew Evans, Chair, Tainted Blood, Nigel Hamilton, Chair, Haemophilia Northern Ireland, John Dearden, Chair, Haemophilia Scotland, Rachel Halford, CEO, The Hepatitis C Trust and Adam Fleming, Director, BTMK Solicitors Ltd to Sir Brian Langstaff, Chair, Infected Blood Inquiry re frustration at government response to the Infected Blood Inquiry