Like Sky, VM will always do deals for new customer - very good deals normally. Many people have posted here when their deals are up and have then contacted VM to see if they can retain them on similar deals.
Like most savvy consumers though, they will vote with their wallets if they believe they can get a better deal with a competitor.
It may be worth leaving the Sky dish attached therefore just in case.
Here's a link to some of the offers VM are currently giving to new subscribers.
http://allyours.virginmedia.com/?bus..._HP_topnav_1_1
Hope that helps, and

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