Short answers, pulled from the story.
The jurisdiction of England and Wales was formed by the Laws in Wales Acts of 1535 and 1542, passed under Henry VIII. These acts brought all Welsh territories fully into the legal system of the Kingdom of England.
The Wales and Berwick Act 1746 specified that references to England in legislation would by default include Wales, making Wales legally invisible by name for over two centuries. The Welsh Language Act 1967 repealed that act, after which new legislation referred to England and Wales as a combined term.
Hywel Dda, known as Hywel the Good, first codified Welsh law during his reign from 942 to 950, when he was king of most of present-day Wales. His code gave Wales a distinct legal tradition that predated the Norman conquest of the region.
A referendum on the 3rd of March 2011 gave the Senedd direct law-making powers without needing to consult Westminster. This was the first time in almost 500 years that Wales held its own powers to legislate.
The Senedd, also known as the Welsh Parliament or Senedd Cymru, was created in 1999 under the Government of Wales Act 1998. It was originally named the National Assembly for Wales and was given expanded powers by the Government of Wales Act 2006.
Companies registering in the United Kingdom must specify whether their registered office is in England and Wales, Scotland, or Northern Ireland, as this determines which law applies to the business. A company that wants to use the Welsh-language ending cyfyngedig or cyf instead of Limited or Ltd. must register its office specifically in Wales.