Devolution in the UK: Origin, Development and Central Government Supremacy

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logo of Uk devolution showing the countries togehter

Devolution in the UK is the transfer of powers from the Westminster Parliament to the Scottish Parliament, the Welsh Senedd and the Northern Ireland Assembly. It changed how Britain is governed. Yet it did not change who holds the final word. This article traces the origin of devolution, follows its development from the Home Rule debates of the 1880s to the settlements of 1998, and shows why central government supremacy remains the defining feature of the UK case.

What is devolution in the UK?

Devolution means delegating power, not dividing it. In a federal system, such as Germany or the United States, the constitution protects the powers of each level of government, and the centre cannot simply take them back. The UK works differently. Under the principle of parliamentary sovereignty, devolved powers are granted by acts of the UK Parliament, and they are theoretically reversible.

The House of Commons Library briefing Introduction to devolution in the United Kingdom calls the result an asymmetric system. Scotland, Wales and Northern Ireland have their own legislatures, while England has only limited executive devolution through mayors and combined authorities.

The key distinction is between devolved and reserved matters. Devolved governments run health, education, housing, local transport, planning and the environment. Reserved matters, such as defence, foreign policy and the constitution, stay with Westminster. Scotland and Wales now use a reserved-powers model: the law lists what is reserved, and everything else is devolved. Northern Ireland uses three categories instead: excepted, reserved and transferred matters.

The origin of devolution: unions, offices and Home Rule

The UK was built in stages. England and Wales were joined in the 1530s. England and Scotland formed Great Britain in 1707. Ireland joined in 1801, creating the United Kingdom of Great Britain and Ireland. Each union raised a question that has never fully gone away: how much self-government can a nation keep inside one state?

The first answers were administrative. A Scottish Office was created in 1885, and a Welsh Office followed in 1964. These bodies managed local affairs, but they answered to ministers in London. They were an early form of devolution, and they show a pattern that returns later. The centre delegates the work and keeps the control. MacKinnon (2015) makes the same point: political devolution was grafted onto this legacy of administrative devolution, which let the UK state resist a more radical shift of power.

The political idea came from Ireland. From 1886, William Gladstone’s Liberal Party backed Irish Home Rule, meaning a parliament in Dublin for domestic affairs inside the UK. The Home Rule Bills of 1886 and 1893 both failed, and the first split the Liberal Party. But they set out the principle of self-government within the Union. Supporters then widened it into “Home Rule all round” for Scotland, Wales and Ireland. So the modern campaign for devolution began with the Liberals. Labour, a century later, was the party that delivered it.

How devolution developed: from Stormont to the 1998 Acts

1914 to 1972: the Northern Ireland precedent. A Home Rule Act passed in 1914 but was suspended during the First World War. After the Irish War of Independence, the Government of Ireland Act 1920 created two parliaments and Ireland was partitioned. Northern Ireland’s parliament at Stormont opened in 1921. It was the first working devolved legislature in the UK. In 1972, during the Troubles, Westminster suspended it and imposed direct rule. This is the earliest proof of supremacy: what Westminster granted, Westminster withdrew.

The 1960s and 1970s: nationalism returns. Plaid Cymru won Carmarthen in 1966 and the SNP won Hamilton in 1967. North Sea oil strengthened the Scottish case. Labour depended on Scottish and Welsh seats, so it set up the Kilbrandon Commission (1969 to 1973), which recommended devolved assemblies.

1979: the first referendums fail. Scotland voted yes, but the yes vote fell short of a rule requiring 40 per cent of the whole electorate. Wales voted no decisively. The election of Margaret Thatcher soon afterwards closed the issue.

The 1980s and 1990s: the democratic deficit. Eighteen years of Conservative government revived the cause. Scotland and Wales kept voting for other parties but were governed by the Conservatives, who held no seats in either nation by 1997. The poll tax, introduced in Scotland a year before England, became the symbol of this grievance. In 1989, the Scottish Constitutional Convention brought together Labour, the Liberal Democrats, churches, trade unions and civic groups to draw up a blueprint for a Scottish Parliament.

1997 to 1999: delivery. Labour won in 1997 with devolution in its manifesto and held referendums first. Scotland voted yes, including for tax-varying powers. Wales voted yes by less than one per cent. The Scotland Act 1998, the Government of Wales Act 1998 and the Northern Ireland Act 1998 followed. The Northern Ireland settlement was part of the Good Friday Agreement. The new bodies began work in 1999, and London gained an elected Mayor and Assembly in 2000.

After 1999: reform by statute. Wales gained law-making powers under the Government of Wales Act 2006 and moved to a reserved-powers model with the Wales Act 2017. Scotland gained further powers through the Scotland Acts of 2012 and 2016, after the 2014 independence referendum. The Welsh Parliament was renamed Senedd Cymru in 2020, and a reform is increasing its size to 96 members. Every step came from a new act of the UK Parliament.

Why Labour delivered devolution

Labour’s motives were political and principled at the same time. The biggest driver was strategic. Labour needed Scottish and Welsh seats to win Westminster majorities, and the SNP and Plaid Cymru threatened that base. Devolution offered self-government inside the Union as an answer to nationalism. At the same time, the democratic deficit was a real grievance, and John Smith, Labour leader from 1992 to 1994, treated devolution as unfinished business. If one reason must be named as the main one, it is the political and strategic reason, with principle as a real but secondary layer.

Critics saw the problems early. Midwinter (1996), writing before the referendums, tied the devolution agenda to 1970s nationalism and to the “crude political centralism of the Thatcher years”. He also warned that the proposals carried anomalies, including the West Lothian Question and a lack of fiscal autonomy. Both questions remain live today.

It was not a reaction to poor economic performance across the UK. If it had been, England would have demanded devolution too. Instead, the North East of England rejected an elected regional assembly in 2004. The grievance was about consent and legitimacy: nations governed by a party they had rejected. Ideology added to it. Deindustrialisation, privatisation and free-market reform clashed with a more collectivist political culture in Scotland and Wales. For more on how party ideology shaped planning and reform, read Politics of Urban Planning: Ideologies, Reforms and Outcomes — The UK Parties Case.

The devolved settlements compared

 ScotlandWalesNorthern IrelandEngland
Founding lawScotland Act 1998, amended 2012 and 2016Government of Wales Act 1998 and 2006, Wales Act 2017Northern Ireland Act 1998 (Good Friday Agreement)Greater London Authority 2000; combined authorities from 2014
Power modelReserved powersReserved powers (since 2017)Excepted, reserved and transferredExecutive powers only
BodyParliament, five-year termSenedd, moving to 96 membersAssembly of 90 members, power-sharing ExecutiveMayors, combined authorities and the London Assembly

The Scotland Act 1998 shows the model clearly. Schedule 5 lists the reserved matters, and everything not listed is devolved. Justice is devolved in Scotland but reserved in Wales, which shows how uneven the settlements are even among the three nations.

England and the asymmetry problem

England has no parliament of its own. After the 2004 referendum in the North East, the idea of elected regional assemblies faded. The result was the West Lothian Question: MPs from the devolved nations could vote on English-only laws, while English MPs had no say on devolved matters. English Votes for English Laws was introduced in 2015 as a partial fix and abolished in 2021.

Research explains why England was left out. Smith and Wistrich (2014) show that England’s regional governance was built without elected bodies and aimed mainly at delivering central government policy and allocating EU funds. The large administrative regions drew little public identification, which helps explain the 2004 result. Fenwick, McMillan and Elcock (2009) conclude that the political conditions do not exist for the English regions to become the main site of English governance. Jeffery (2006) adds that local authorities in Scotland and Wales backed devolution and helped embed it, while most English authorities preferred to deal with national government directly, which helped sustain centralised rule. MacKinnon (2015) sums up the result: England is the only part of the UK governed centrally.

Within England, devolution came in pieces. London received a Mayor and Assembly in 2000. Since 2014, devolution deals have created combined authorities with elected mayors in city regions such as Greater Manchester. Their powers cover areas such as transport, skills, business support and some planning. But these are executive powers agreed with central government, not law-making powers. In 2010, the Coalition government abolished the regional bodies and replaced them with Local Enterprise Partnerships and city deals. Smith and Wistrich note that many regional functions, such as strategic planning, housing and transport strategy, then reverted to central government despite the language of localism. Regional development in England is still largely set from Whitehall.

Central government supremacy: the legal evidence

Legal and constitutional rules make Westminster’s position clear.

  • Westminster can still legislate on devolved matters. The Sewel convention says Westminster “does not normally” do so without consent. Parliament recognised the convention in the Scotland Act 2016 and the Wales Act 2017. But in the 2017 Miller case, the Supreme Court held that courts cannot enforce it. The word “normally” does the work. In 2020, the UK Internal Market Act passed even though the Scottish Parliament and the Senedd refused consent.
  • Ministers can block devolved laws. The Secretary of State for Scotland holds powers to intervene. In January 2023, a Section 35 order stopped the Gender Recognition Reform (Scotland) Bill from receiving Royal Assent.
  • Constitutional questions are reserved. The UK Supreme Court decides disputes over legislative competence. In 2022 it ruled that the Scottish Parliament cannot legislate for an independence referendum without Westminster’s agreement.
  • Institutions can be suspended. Westminster suspended Northern Ireland’s institutions in 1972 and again from 2002 to 2007. When the Executive collapsed in 2017 to 2020 and 2022 to 2024, the UK Government had to step in on matters such as the budget.
  • Intergovernmental relations are consultative. The structure has three tiers: the Prime Minister and Heads of Devolved Governments Council, standing committees (including one for finance), and policy groups. Disputes escalate through stages, with third-party mediation possible. These forums support dialogue. They do not give the devolved governments a veto over UK law.

Central government supremacy: money and resources

Most devolved spending arrives as a block grant from the UK Treasury. The grant is adjusted by the Barnett formula, introduced in 1978. When spending on a devolved service changes in England, each nation’s grant moves by a population-based share. Two things follow. Devolved budgets rise and fall with decisions made at Westminster about English spending. And the formula is a convention, not a law, so the Treasury could change it. Wales has had a needs-based funding floor on top of Barnett since 2016, which shows that the rules are negotiated, not guaranteed.

Tax powers have grown, but they remain partial. Scotland now sets income tax rates and bands on most earnings. Wales has devolved taxes and has set income tax rates since 2019. Yet VAT, National Insurance and corporation tax stay reserved, and devolved borrowing is capped. Natural resources follow the same logic. Revenue from North Sea oil and gas goes to the UK Treasury because energy is largely reserved. That is the origin of the SNP slogan “It’s Scotland’s oil”.

Research supports this reading. Mackay (2001) calls finance “the spinal cord of devolution”. He argues that public spending above tax receipts in poorer regions is a normal result of treating citizens equally, not a subsidy. He also notes that the UK remains a highly centralised state, in which devolution is only a tentative counter. MacKinnon (2015) shows the practical effect: because devolved governments had limited revenue-raising powers, austerity cut their budgets, even though they criticised it.

Brexit tested the system again. EU Structural Funds, which supported regional development, were replaced by UK-run schemes such as the UK Shared Prosperity Fund and the Levelling Up Fund. The devolved governments criticised these funds for bypassing them. In regional development, the centre had gained control of money that used to flow under shared rules.

Case study: who decides urban development in Scotland?

Suppose the Scottish Government wants to build a large urban development. Planning, housing, local government and economic development are all devolved. So Scotland decides what to build, where and in what form. It does not submit the plan to Westminster for approval, and no UK minister can veto it on its merits.

The limit is money. Scotland does not ask the Treasury for funds scheme by scheme. It pays for the project from its annual block grant, by giving it priority over other spending. It cannot enlarge the total budget on its own, because the grant is set in London, borrowing is capped and tax powers are limited. So it must reprioritise, use its limited borrowing and tax powers, or scale the project back. Some large projects are also funded jointly under City Region Deals, which means both governments must agree. And UK-run funds can finance local schemes in Scotland without going through the Scottish Government.

The pattern is clear. Scotland controls the “what” and the “how” of urban development. Westminster controls “how much” is available in total.

Research links devolution closely to economic governance. Jones, Goodwin and Jones (2005) treat the two as intertwined and warn against assuming that devolution improves economic governance. Goodwin and colleagues (2002) found that each territory built a different set of institutions for economic development, and they flagged the risk of uneven capacity between territories. These studies date from the 2000s. They explain how the system was designed, not how it performs today.

Conclusion: delegation, not division

Devolution travelled from a Liberal idea, through the Northern Ireland experiment, to nationalist pressure in the 1960s and 1970s. It failed in 1979, grew through the democratic deficit of the Conservative years, and was delivered by Labour in 1997 to 1999. It has real effects: the devolved nations make their own choices on health, education, planning and housing.

But the UK case shows delegation, not division, of power. Westminster keeps the legal right to legislate, to block, to suspend and to set the financial frame. England, the largest part of the UK, remains the missing piece. The live question at the heart of the UK constitution is the gap between autonomy over decisions and control over resources.

Sources and further reading

polititcal agenda urban planning