Grogan helped lead the rebellion on the Racial and Religious Hatred Act 2006, resulting in two Government defeats on the bill and ‘threatening' rather than ‘insulting’ behaviour being established as the test of religious hatred. At the public bill committee stage of the Flood and Water Management Act 2010 he proposed an amendment, winning 8–7 against the Government. This ensured that the Regional Flood and Coastal Management Committees retained the power to approve the Environment Agency’s flood management bill rather than just the right to be consulted about it.