2. The Budget and Parliament Law of the United Kingdom

Conclusion
The United Kingdom has four legal systems, each of which derives from a particular geographical area for a variety of historical reasons: English and Welsh law, Scots law, Northern Ireland law,[1] and, since 2007, purely Welsh law as a result of Welsh devolution, with further calls for a Welsh justice system.[2][3][4]Overarching these systems is the law of the United Kingdom, also known as United Kingdom law (often abbreviated UK law), or British law. UK law arises from laws applying to the United Kingdom and/or its citizens as a whole, most obviously constitutional law, but also other areas - for instance, tax law.In fulfilment of its former EU treaty obligations, European Union directives were actively transposed into the UK legal systems under the UK parliament's law-making power. Upon Brexit, EU law was transplanted into domestic law as "retained EU law", though the UK remained temporarily in alignment .

References

1. 
   ^ “The UK has three legal systems, operating in England and Wales, Scotland and Northern Ireland”, direct.gov.uk, accessed 12 March 2007
   
2. 
   ^ "Written Statement: Update on the development of the justice system and the legal sector in Wales (30 September 2021)". GOV.WALES. Retrieved 29 November 2022.
   
3. 
   ^ "Plaid Cymru call for devolution of justice to Wales - 'we can't be treated as an appendage to England'". Nation.Cymru. 29 November 2022. Retrieved 29 November 2022.
   
4. 
   ^ Jump up to:^a b "Devolution a 'necessary step' towards a better Welsh criminal justice system, academics argue". Cardiff University. Retrieved 22 February 2023.
   
5. 
   ^ "pdf file" (PDF). (64.6 KiB) "For the purposes of the English conflict of laws, every country in the world which is not part of England and Wales is a foreign country and its laws foreign. This means that not only totally foreign independent countries such as France or Russia... are foreign countries but also British Colonies such as the Falkland Islands. Moreover, the other parts of the United Kingdom – Scotland and Northern Ireland – are foreign countries for present purposes, as are the other British Islands, the Isle of Man, Jersey and Guernsey." Conflict of Laws, J. G. Collier, Fellow of Trinity Hall and lecturer in Law, University of Cambridge
   
6.