Hey,
I can definitely help with that.
For ultra-realistic British voices (both male & female), here are solid options.
I use
Female (British accent):
ElevenLabs – “Rachel” (UK tone, very natural and expressive)
Play.ht – “Sophie (British)”
Male (British accent):
ElevenLabs – “Adam” (clear RP British style)
Murf AI – “Daniel (UK)”
I can recommend the most natural-sounding setup and tuning for it if you can let me know your AI agent, ads, narration, outbound calls.