It would be really nice if they had a UK English accent with UK English specific words and phrases. We don’t use, spell or pronounce certain words the same way as American English.
I agree it should be an official option… but… Have you tried asking her? .. I’ve been able to get mine to speak in olde shakespearian English with an eccent.. we’ve also tried others but she’s not particularly great at any of the strong accents like Australian, Irish or liverpudlian for example 
She takes alot of training and reminders sometimes but you can get some things to stick with consistency
Ahh thanks. Yes I’ve tried twice. So maybe she needs a bit more training. Is there anything specific you said to yours to get her to talk in olde English?