We currently use enom.com as a registrar for all .uk domains. Their IPS tag is ENOM.Name servers
If you're not registering a domain with us or transferring over a domain, you can use another...Using your domain name with Tumblr
Tumblr allows you to use custom domain names with their blogging service so your Tumblelog is...What is Domain (Transfer) Secret or Authorization (Auth.) Code and how you can obtain it from your Current Registrar?
A Domain (Transfer) Secret or Authorization Code is a code assigned by the Registrar at the time...