/ˈriːdʒənl lɔː fɜːrm/ – Phrase
Definition: Firm specializing in legal services within a specific region.
A more thorough explanation: a term used informally to describe a law firm based in one area (or sometimes two areas) in the United Kingdom outside of London which generally only advises companies based in that area and on issues relating to the area
Example: There are two leading regional law firms active in the Newcastle area.