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Originally Posted by Matt D

I thought that the extension kits were for the router, not the modem?

Nope, it's for the modem.

For the router anyone can use any old Cat4+ ethernet cable.

If the active NTE [the Openreach modem] is to be sited more than approximately 1.5 metres from the NTE5 [the master socket], a data extension kit will be required to deliver the Ethernet service [probably in reference to FTTC being GEA] to the modem. The data extension kit provides a maximum additional 30 Metres distance from the NTE5 [the master socket] and can be routed internally or externally to an additional data extension point where the active NTE [the Openreach modem] can then be connected. The data extension kit is a chargeable addition; CP‟s are advised to determine whether this kit is required for their End Users in advance of an order being placed

and

FTTC demarcation rules are as follows - The NTE5 is the Network Termination Point of the Openreach access network within the end user’s premises, although Openreach also maintains the active NTE. The active NTE is the FTTC VDSL modem and will be located close to a power source and the desired service location. The active NTE can be located separately from the NTE5 and can be connected via Data Extension Kit (DEK) cabling up to a length of 30m. Any Openreach-installed data extension wiring comes with a one-year warranty and becomes the end user’s property

The data extension kit is basically a plug-in phone extension with RJ11 plugs, pretty much the exact same as you already have (perhaps a bit higher quality though). You might lose 10-20% of your speed (depending on length and quality of the extension) but it'll probably still be a lot faster than non-Fibre-assisted DSL.

---------- Post added at 12:18 ---------- Previous post was at 12:07 ----------

Originally Posted by craigj2k12

Hes either talking about:

using the current extension socket
using 20m rj11
or running ethernet where the current extension socket cable runs

Actually, all three
1) He's already doing this and I see no reason why he can't continue
2) (Correction to myself, it's actually 30m) This is supplied optionally during installation
3) This is what I do.