United Kingdoms has a Discord server for voice and text chat in real time. All United Kingdoms members and potential recruits are encouraged to use it.
You can sign up to it by following the link below:
https://discord.gg/0uRQE1uOZU6OmQdu
If you do not have a Discord account you'll need to sign up for one. You'll then be taken to the server where you can talk and chat with other members. I highly recommend that you download the Discord desktop client for both Windows and Mac as it has features that the web interface lacks. You can download it from here:
https://discordapp.com/download
once you have it installed and have logged into your account you should be able to access the United Kingdoms server as usual.