Microsoft states that Cortana is available in the UK.
Even if region, language and input are set to UK, users are unable to get Cortana.
This is a well-known bug from Microsoft.
There's a workaround for that bug.
- Cortana shows you with two options: Settings and Not Interested.
- When you click settings it will take you to another page only to tell you that then you cannot enable Cortana as it is "not available in my region".
- However If you click Not Interested, you'll be taken to a page to setup Cortana.
Someone at Microsoft must have changed the Button's text as an Evil joke