Politicians, lawyers, activists and survivors of child abuse crowded into a committee room in the Palace of Westminster ... demanding a thorough and transparent government inquiry into historic child sex abuse allegations. Rumours have swirled in recent years about a cover-up in the British establishment involving senior politicians and police that has seen prominent figures engaging in child abuse and murder. Police have described evidence from one survivor relating to abuse at the Dolphin Square estate in London and at least three murders "credible and true". Yesterday's event, arranged by the WhiteFlowers group, was designed to keep up the pressure on home secretary Theresa May. The group has recently been vocal in challenging May's decision to exclude representatives of victims' groups from the Independent Inquiry into Child Sexual Abuse, which has been dogged by controversy after both Baroness Elizabeth Butler-Sloss and Dame Fiona Woolf were forced to resign from chairing it due to their links to establishment figures. A New Zealand judge was appointed to chair the inquiry earlier this year. She has said that "the appointment of victims or survivors to the panel will not, in my view, be consistent with the objectivity, independence and impartiality that is required of members of an independent panel" - comments that have left campaigners furious. John Mann MP ... spoke, demanding that the Official Secrets Act be lifted. One survivor who was placed in care in homes in Rotherham, Warrington, North Wales and Rochdale, told the audience in an earlier meeting that abuse had taken place in each home.