@BigPaul 

I have exactly the same behaviour with my C2300, Sky Q silver box + 2 mini's and a Sky wireless booster all show as wired clients although only the Sky Q silver is actually connected via ethernet cable. All below are Sky products bar FMS which is a NAS device.

The c2300 is in router mode, I am having connection problems with dropouts even on the ethernet connection. The Sky mini devices connect via their own Mesh network to the Sky Q silver box but also connect to the router wirelessly.

It's all wrong and needs to be fixed please.

@Grizgut 

This is my wireless network. Virginmedia and Virginmedia N5 are the 2.4ghz and 5ghz networks produced by the C2300. I have changed the channels so that there is no interference. The items towards the botttom I'm assuming are my neighbours.