"VDSL Vectoring is not unlike the noise cancellation technology that you often find in some headphones and works to cancel out crosstalk (interference) on the “last mile” run of copper cable (i.e. between your local street cabinet and home), which could result in a noticeable speed boost.
Some have speculated that Vectoring could push BT’s FTTC service beyond 100Mbps and, with the help of a few other tweaks, possibly as high as up to 200Mbps. But BT’s
initial focus will not be on raising the headline rate and they instead
envisage it being used to improve existing performance to more users;
especially for those on longer lines where interference is a big