Referendums in the UK

For most of its history, the United Kingdom decided even its largest questions through Parliament rather than by asking the public directly. The referendum — a direct vote of the electorate on a single question — is a relatively recent and still contested feature of British politics. There was no UK-wide referendum until 1975, yet a handful of them have since reshaped the country, from the voting system to the very borders of the state. Understanding referendums means grasping a peculiarly British puzzle: how a vote of “the people” fits alongside the doctrine that Parliament is sovereign.

Advisory versus binding

The most important distinction is between binding and advisory referendums. A binding referendum legally compels a particular outcome; an advisory one formally only advises Parliament, which remains free to decide what to do with the result. In the UK, referendums are generally advisory in strict law. The reason is constitutional: under the doctrine of parliamentary sovereignty, Parliament is the supreme law-making body and, in legal theory, cannot bind itself or be bound by an external vote. A referendum therefore does not, by itself, change the law unless legislation is passed to give effect to it.

In practice, this legal nicety coexists with a strong political reality. Governments and Parliament have treated the results of major referendums as politically binding, even where they were legally advisory. The 2016 vote to leave the EU, for instance, was advisory in law, but was acted upon as a decisive instruction. The gap between legal form and political force is where much of the controversy around referendums lives.

The major UK referendums

Four UK-wide or nation-wide votes stand out. In 1975, the first UK-wide referendum asked whether the country should remain in the European Economic Community, which it had joined in 1973. Voters backed continued membership by roughly two to one. In 2011, a UK-wide referendum asked whether to replace first-past-the-post with the Alternative Vote for electing MPs; voters rejected the change by about 68% to 32%, and FPTP was retained.

In 2014, voters in Scotland were asked whether Scotland should become an independent country. On a remarkably high turnout, they chose to remain part of the United Kingdom by about 55% to 45%. Then in 2016, a UK-wide referendum asked whether the UK should remain in or leave the European Union. Voters chose to leave by about 52% to 48% — the result known as Brexit, which led to the UK’s eventual departure. Together these votes show the range of questions referendums have settled: membership of international bodies, the electoral system and the territorial integrity of the state itself.

How they are called and run

There is no automatic right to a referendum in the UK and no general law requiring one for particular kinds of decision. Each is held only when Parliament passes legislation providing for it, almost always at the government’s initiative, with its own Act setting out the question, the franchise and the rules. The Electoral Commission, the independent regulator, plays a central role: it assesses whether the proposed question is intelligible and unbiased, registers and oversees the official campaigns, monitors spending limits, and reports on how the vote was conducted. Most UK referendums are decided by a simple majority of those voting, with no minimum turnout — though the 1979 Scottish devolution vote was a notable exception, requiring at least 40% of the registered electorate to vote yes, a threshold a narrow yes majority failed to clear.

The tension with parliamentary sovereignty

The deepest debate about referendums is constitutional. Britain is a representative democracy: voters elect MPs to deliberate and decide on their behalf, and Parliament is sovereign. A referendum injects an element of direct democracy, appealing over the heads of representatives to the people themselves. The two principles can pull against each other — most visibly when a referendum result points one way and parliamentary majorities lean another, as happened during the prolonged Brexit process.

There are reasonable arguments on both sides, and a non-partisan account should set them out fairly. Supporters argue that referendums confer direct democratic legitimacy on the biggest constitutional choices, settle questions that cut across normal party lines, engage the public and entrench decisions more firmly than an ordinary vote. Critics counter that complex issues are compressed into a binary, that campaigns can be distorted by money or misinformation, that narrow results can prove divisive, and that Parliament — with time to deliberate, amend and protect minority interests — is often better placed to decide. The UK has not resolved this tension; it manages it case by case, which is why each referendum tends to reopen the same fundamental questions about who, ultimately, should decide.