Allows for regional political differences, a more left-leaning Scotland, has higher taxes on the rich
Strengthened union between nations, they have control over domestic areas but benefit from defence and international trade
Popular with voters
Allows for a variety of electoral systems
Nations can use legislation from the other nations e.g. Scotland's 2006 decision to ban smoking in enclosed spaces was then extended to all the other nations
Negatives
Inequality in costs of public services e.g. uni tuition is free in Scotland but not in England
Encouraged demands for further separation and full independence, therefore weakening the unity of the UK, the SNP called for a second independence referendum
Cross-party working in Northern Ireland often leads to gridlock