If the Conservatives don't go ahead with it then they risk their supporters leaving to UKIP, and a government formed by 52% of the population voting for the onl

If the Conservatives don't go ahead with it then they risk their supporters leaving to UKIP, and a government formed by 52% of the population voting for the only party that will fulfil the results of the referendum. Even a 15% swing from Conservative to UKIP would destroy most of the party, due to the awfulness of the FPTP voting system. And the Conservative leadership won't risk that.