Well I am using a MK3 version (brought a couple) of the following that doesn't require touching any wires on the master sock at all, well if your careful that is.
GENUINE BT Openreach - vDSL Interstitial Faceplate
You can get them from Amazon for several quid, please note, this is assuming you still already have the NTE3a Phone Face Plate.
And the cool thing is you can either plug your Modem/Router in at the front of the vDSL fate plate via its RJ45 socket (yes, you can connect your Modems/Routers RJ11 connector in there), or use the two pin IDC connector where you can attach your data extension so you can place your Modem/Router where you want it.
With the NTE5A Master Socket, vDSL plate and BT front plate it sticks out about 6cm from the wall, assuming the back box is flush to the wall.
So if you need one you now have an extra place that you can buy one from.
Please be warned that this requires that you have BT NTE5 Master Socket, but this should of been fitted when you got the Fibre installed.
But yeah, I would follow what TheEulerID said to do, there is no point installing the Modem/Router on an extended cable if you don't know the max speed that you can achieve if nothing is connected.
Please beaware you "may" have to leave it connected on the master test socket for a while for it to settle.
As for using 4 pairs of twisted cable, I am not really a fan of leaving unused pairs unterminated like that, any wires unterminated becomes an antenna picking up more noise, but that's just me.
Now what would I choose between a micro filter or a mater faceplate ADSL/vDSL filter.
Hmm, easier answer, NTE5A ADSL/vDSL filter anytime, but that would depend on who made it.
Edited by PaulKirby (Mon 12-Jan-15 02:56:23)