Re: "I would like to create a Personal Voice recording"
This is Apple Support's recent iOS 26 article:
How to: Create a Personal Voice on iPhone, iPad, or Mac - Apple Support
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Re: "Personal Voice language options missing UK English"
"Is there a bug fix in the pipework" ... "Why no English UK".
Yes. There are very few language options for Personal Voice.
Seems it is still early days for personal voice:
Many are grateful to be able to access what is already freely available.
Languages for many countries are not yet available. Generally no-one here in the community knows what Apple will do in future, until new features or languages become available.
iOS and iPadOS 26 - Feature Availability - Apple
Eg: says:
Accessibility: Personal Voice
- English (United States)
- Mandarin Chinese (China mainland)
- Spanish (Mexico)
That's the choices for now, just as you have experienced.
If you wish: You can communicate your desire for your own UK language preference to the accessibility support team:
To provide feedback about an accessibility feature on an Apple product, email the Accessibility team: accessibility@apple.com