When you take out a contract with Virgin Media it is for your current address, and you agree to keep the services at that address for the minimum term specified. There is no guarantee within the contract that your services can be transferred to another address.
The situations for what happens when you move home are detailed in Section 'N' of the Terms and Conditions which apply to your service contract - http://www.virginmedia.com/shop/the-legal-stuff/terms-and-conditions-for-fibre-optic-services.html#moving
The situations for what happens when you move home are detailed in Section 'N' of the Terms and Conditions which apply to your service contract - http://www.virginmedia.com/shop/the-legal-stuff/terms-and-conditions-for-fibre-optic-services.html#moving