Your picture of the standard faceplate with the 2 3 and 5 connections, if I'm not mistaken. The middle one with the orange is number 3 is it? If so, and if not go to whichever is "3". Gently remove the one on connection 3. Do not cut it.
Then see what speed you get once you reassemble that.
The fancy (MK?) socket I know little about. So need to know what the connector numbers are. Nothing obviously corresponds with the standard master faceplate, which worries me a bit. But with luck it doesn't matter.
I'm still not clear about
In my living room there are two phone sockets, one on an outside wall and one on an internal wall. I've just moved in and we're told one is a wired link to the socket in the bedroom, as in you use a splitter from the main socket into the other one and you then have a working socket in the bedroom too. The engineer has fitted a faceplate on the internal one.
Trouble is, even when using the master socket on the new faceplate the other one is still active, i can even connect to Infinity on it; so they're linked even via the master socket. Each socket has two sets of wires, twisted together into the same connectors (pins 2 and 5) on the non faceplated one and also the bell wire (pin 3) is connected on both, if that matters.
Particularly the "you use a splitter from the main socket into the other one". A cable? From which socket of the splitter to where?
Does the bedroom one work when you have the pictured faceplate removed? Like when you took the photo? (Just checking a phone plugged into gets a dial tone or not is enough to check, if you have a landline phone).
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