We have lots of great British voices in our voice library! Or if you want to hear an american trying to do a british accent add "[British accent]" at the start of the generation
It would be good if your demos made it more obvious. There's a vast arrays of AI developments wanting me to check them out - you have seconds to get my attention.
> Generally it appears the TTS systems all do US accents and the British accent tends to sound like Frasier - an American faking an British accent.
Frasier Crane's accent is an American actor portraying an American character who (with variable intensity depending on situation) is affecting, over the character's own natural accent, either a constructed American accent (the Transatlantic) or a natural American accent (Boston Brahmin), there is some dispute about which or whether its a blend, both of which share some features (in the former case, by deliberate construction) with British pronunciation.
Generally it appears the TTS systems all do US accents and the British accent tends to sound like Frasier - an American faking an British accent.