I need to temporarily relocate my Hub 5 into a different room from where the Master Socket is. The supplied cable will not be long enough.

Am I right in thinking the cable connecting the Hub 5 DSL Socket to the Master Socket is RJ11 to RJ11.

Yes, yes. Answered twice because yes has only 3 letters.

A BT Master sockt is not an RJ11. It's a BT plug to BS6312. Cables usually have BR6312 at one end and RJ11 at the other. Also note that there are at least two ways to wire an RJ11, using pins 3&4, or pins 2&5.

Pedanticism aside, OP might have VDSL which means the filtered faceplate is installed and thus it looks like the master socket has an RJ11 too, for the DSL

The bog standard Openreach VDSL faceplates have an RJ45 socket which is wired so that a RJ11 plug will work.

Thanks Jimbo806 a straight forward simple answer

Who mentioned anything about wiring an RJ11 plug, he just want's a longer wire?

By bog standard, do you mean the filtered faceplate that screws over the master socket, if so, they are RJ11

So why is it that every single supplier of NTE5 VDSL faceplates describes the modem socket as RJ45?

http://www.run-it-direct.co.uk/btvdslfaceplate.html
www.amazon.co.uk/dp/B00NMUXPOS/
http://www.claritybroadband.co.uk/te..._faceplate.htm
http://www.claritybroadband.co.uk/cl...-Modified.html
https://www.tlc-direct.co.uk/Products/GPNTE5ADSL.html
http://www.maplin.co.uk/p/kauden-vdsl-faceplate-n96ll

An RJ45 socket is physically compatible with an RJ11 plug

I stand corrected (again), just had a try with a Ethernet cable and you were right, it fits. I think I'll ask you what colour I should paint my living room next time I redecorate