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Connect to the master socket.
The 5c is a filterd faceplate so the broadband signal is filtered out of any extentions. I cannot understand why a 5c faceplate was fitted to an extension as well.
Thank you, so basically the 5C socket where the extension is needs to be replaced for the broadband to flow through?
Both of my sockets are as shown above, just one socket
Both appear identical with Master Socket 5C on them.
It depends on where you want to plug the home hub into, as any unfiltered extension wiring is likely to reduce speed.
The master one, should really be a filtered socket, provided that is where you are going to plug the home hub.