Scotland has had extensive devolution, with the Scottish parliament now holding powers covering health, education, local government, environment, justice and policing.
Holyrood also has powers to set most income tax rates (although not the level of the tax-free personal allowance) and has some control over welfare.
The Welsh Senedd’s devolution powers are more limited compared with Scotland, though it does include running the NHS in Wales, education, local government and housing.
The Senedd also has some tax powers, including the ability to to vary income tax rates. But, unlike Scotland, it has no justice or policing powers.
Under the terms of the 1998 Good Friday Agreement, the Northern Ireland Assembly has significant devolved powers, including over health, education and housing.
There has also been some devolution to English city regions over the past decade, albeit less extensive than for Scotland, Wales and Northern Ireland.
Manchester has some of the most extensive devolved powers of any of the English city regions, with some authority over transport, housing, skills and health spending.