Before the Election, David Cameron promised a Sovereignty Bill. In his speech entitled Giving Power Back To The People he said: ‘As we have no written constitution .  .  . we have no explicit legal guarantee that the last word on our laws stays in Britain .  .  . so, as well as making sure that further power cannot be handed to the EU without a referendum, we will also introduce a new law, in the form of a United Kingdom Sovereignty Bill, to make it clear that ultimate authority stays in this country, in our Parliament

Conservative MPs did not want to vote for a referendum on the Alternative Vote, a system they dislike. Many did not want a reduction in the number of MPs and the boundary changes that entails so soon after winning their seats for the first time. They did not want to support the increased External Action Service of the EU or the expanded EU budget. They did not like the 5 year Parliament  bill, the increase in the EU and Overseas Aid budgets nor some of the defence cuts.