The recent (May 2025) case of Mazur v Charles Russell Speechlys LLP has confirmed the position set out in the Legal Services Act 2007 that only authorised persons may carry on the conduct of litigation.
Although a person may be regulated by virtue of working within a regulated practice, unless also authorised individually they may not conduct litigation and may only support an authorised person to do so.
What constitutes conduct and support will be fact-specific but the authorised person (regulated attorney) must assume responsiblity and exercise their professional judgement over key decisions and formal steps. They may be supported in doing so by an appropriately supervised non-authorised person who may take on the preparatory and administrative tasks involved in the process.
See here for more information about the Litigation and Rights of Audience etc Rules.