 Complete the following phrase:  The matter of a referendum on joining the euro, after much press speculation, was raised again at Cabinet by Douglas Hogg in the spring of 1996, very likely in Clarkes view with Majors approval; Clarke records that Heseltine spoke with passionate intensity at Cabinet against a referendum, believing both that referendums were pernicious and that no concession would be enough to please the Eurosceptics. Clarke, who had already threatened resignation over the issue, also opposed the measure and, although Clarke and Heseltine were in a small minority, Major once again deferred a decision. Major, Heseltine and Clarke eventually reached agreement in April 1996, in what Clarke describes as a tense meeting ... rather like a treaty session, that there would be a commitment to a referendum before joining the euro, but that the pledge would be valid for one Parliament only i.e. until the general election after next, with the Governments long-term options remaining completely open; Clarke threatened to resign if this formula were departed from. Heseltine had opposed a referendum on euro membership when Thatcher proposed it in 1990. Clarke, writing in 2016 after the 