If your .UK domain is managed by SiteGround, you can change its IPS TAG from:

Customer Area -> My Account -> Domain Names -> Manage button -> Domain Name Tag

For a detailed tutorial on how to change your domain TAG, please refer to our Tag Change Guide

If your .UK domain is not registered by SiteGround but you need to change its TAG in order to initiate a domain name transfer, you should contact your current registrar and ask them to make the change. The domain name tag should be set to ENOM before the transfer can be initiated.

Once the tag has been set to ENOM, you can initiate the transfer from your SiteGround Customer Area > Order tab > Domain Transfer.