We have had Sky BB for a while. First with the horrible white sr101 router then with the equally bad black sr102 version.
We used to get around 10Mbps but recently it's dropped to anywhere between 2 and 4Mbps
I swapped out the main socket faceplate for a VDSL one and used the existing extension upstairs to the router as a dedicated data line although it's not twisted pair.
I've ordered a cat5e cable with RJ11 connectors to replace the std flat cable it came with and an external antenna kit to replace the internal things.
I also want to shield the internal power supply as that must be chucking out some interference.
All in all around £15 of bits.
IF that fails, has anyone used a different wifi router? I've read that sky t&c say you have to have the hub as the first item but you can put a newer better WiFi router onto it.
EDIT - I have tried changing channels already