This socket is the Main, or Master phone socket.
10 x Crabtree Capital 2 Gang Double USB A&C 13A Switched Socket | 4306/USBC
10 x Crabtree 4306 Capital Switch Socket 2 Gang SP 13 Amp
Pack of 10 x Crabtree Capital Switch/Socket Replacement Neon with Lens
1 x Crabtree Capital 4306/USB/D Twin USB Double Socket with 2 x USB
5 x Crabtree Capital 2 Gang Double USB A&C 13A Switched Socket | 4306/USBC
3 x Crabtree 7047 5 amp Roundpin Unswitched Sockets