One thing, keep in mind that the sync speed being low doesn't confirm that your line is poor, as it is essentially set by Virgin.
For example, with Sky broadband if your router reboots it's often interpreted as a line failure, leading to your sync speed being lowered (mine was as low as 3Mbps at one point).
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Finding the master socket and connecting via the test socket behind the faceplate would be a good start.
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Seconded. If you're not sure where the master socket is, it's normally the first one closest to where the phone line enters the house.