try the ballad or fable voices

Doesn't really sound very British to be honest.

Sounds kinda international/like an American trying to do a British accent.

I've been looking for real TTS British accents so this product doesn't meet my goals.

Azure TTS has some great British accents - I used a British female voice for a demo video voice over, and the quality was great. Not as good as ElevenLabs, but I was still really impressed with the final result.