What is an IPS TAG?
An IPS TAG (sometimes called an IPSTAG) is a unique identifier given to each Domain name company (Tag-Holder) with Nominet, the registry for all UK domain names. The tag is used to identify the company responsible for the management of a domain but they only apply to UK Domains like .co.uk , .uk.com, .uk.net, .me.uk .ac.uk and .org.uk.
If you want someone else to look after your domain name you can do this by changing your IPS Tag. To change IPS Tag you need to contact the company where you have registered the domain name and ask them to change the TAG to the TAG of your new provider. You may also have to let the new provider know that an incomming transfer is comming its way.