I am in the UK and I have a PC. Windows 10 has been installed. I want Cortana. How can I get it?

[Windows Central Question]

I am in the UK and I have a PC. Windows 10 has been installed. I want Cortana.

In Settings it says "Cortana isn't supported in the region and language you've selected". How do I fix this?

I'm in the UK and I have a UK sourced PC and my language is set to English (United Kingdom). What have I to change to get Cortana and how do I do it? (I don't want to change my language.)