In this article you will find guidance on how to move a UK domain to a 1&1 package. If you wish to keep your domain with your current registrar but use the domain with 1&1 WebHosting, you can transfer an external domain to 1&1.
You can also initiate a transfer when signing up for a new 1&1 package from the Order Page. When ordering the package you will be prompted to choose domains to add to the package. Simply enter the domain you wish to transfer into the package when prompted and follow the instructions provided.
Follow the instructions on how to transfer a UK domain to an existing package with 1&1: