Cost to replace BT Master socket

[#1]

It says 5C, but no idea which version.

[#2]

@dawson '5C' is the socket version,  'Mark 4' is the faceplate, with separate VDSL and phone connections - sorry I wasn't clearer.

[#3]

No, it just has a single phone socket on it.

[#4]

Very strange - if they fit a 5C smaster socket, the Mk.4 faceplate usually 'comes with it'.

[#5]

If there's no wired extensions, then there's no need for a Mk4 faceplate apart from maybe it looks neater. In fact given the poor quality of connectors on the MK4, its probably better without

[#6]

OK @MisterW  - although I never had any issue with my Mk.4.

[#7]

@dawson said "No, it just has a single phone socket on it." so how is the router connected?

Do you still have a "rat-tail" filter acting as an adapter or a direct BT-RJ11 cable?

(I went one stage simpler/tidier and have a RJ11 cable that is terminated behind the faceplate on the sockets provided, so just exits from the bottom edge through one of the slots there)