The RSGB’s EMC committee has updated its advice leaflet number 15 on VDSL interference.
This leaflet explains how to recognise VDSL interference and summarises the measures that people have found that helped to reduce the interference.
It must be emphasised that these are things you can try and they are not guaranteed to eliminate the problem at all locations.
Indeed in some locations, none of these suggestions reduces the problem significantly.
Download RSGB VDSL Interference Leaflet Update - http://www.rsgb.org/emcleaflet15 (7-page/564KB PDF)