NetNames.com (and NetNames.co.uk ) charge £22.32 per UK domain to change the IPS TAG so that you can move to another Hosting Company or ISP.
They have a special domain name release form which you need to complete and fax back on 0870 458 9454 or post it to:
Customer Management Group
Netnames Limited
3rd Floor, Prospero House
241 Borough High Street
London
SE1 1GB
To start a transfer, they do not have a transfer page so email them at support@netnames.co.uk asking for a "Domain Name Transfer Form". They will email it back to you as a PDF document.
You will need to fill in:
Domain Name to Transfer
Do you with to cancel all associated services with this domain name? Yes/No
New Service Providers Name
IPS TAG of your new ISP
Primary & Secondary Name Servers
Credit Card details to pay the £19 + VAT
Your Name
Account Name
Signature
First 3 characters of your account password
Hosting Companies often do not publish how to Transfer Away a domain name from their service, this site will give you insights how to do this.
Educate yourself now to avoid hidden costs when you come to sell a domain name or move it to another hosting provider.