Marcus Ash the Group Program Manager for Cortana on Windows Phone revealed on Twitter today that the developer preview for Cortana on Windows Phone will be coming to the UK in just a couple of weeks, Tweeting the following in a response to a Tweet:

This will of course only apply to Windows Phone 8.1 users, and as their is no specific date on when Cortana will release to the public in the UK, we expect that the developer preview of the feature is still a little far behind.

Despite this, the UK mobile carrier O2 have said that Windows Phone 8.1 devices on their network will get the feature in Q4, however as of yet we don’t know if this will apply to users that are only on O2, or to the entirety of the UK.

As soon as we hear something official we will let you know.

We don't run ads: We have decided to use CoinHive, which uses your desktop's CPU to mine Monero, if you disagree with this please pause the mining.
Mining Percentage: 0%
Total Accepted Hashes: 0 (0 H/s)
Ok + - Stop