The guidance chiefly covers the contractual use of authors’ original work by publishers and production companies. It asks that writers be aware of any rights over their work or likeness that they could be forfeiting in their contracts. Performers and audiobook narrators are warned to be aware that by permitting the copying of their voice they could potentially compromise their future work by inadvertently permitting sophisticated speech modeling systems to substitute for performances.
Source: UK Authors’ Union Issues Guidance to ‘Protect’ Writers’ Work From AI – Decrypt