Power Ethernet replaces your double-gang plug socket with 4-port Powerline connectivity - Tech Digest
Powerline 200AV Power Ethernet Socket T1002 with 4 LAN HomePlug AV | eBay
Two Gang UK Power & USB (2amp) Socket from £13.50
Power Ethernet Distribution System Review | AVForums
Electrical UK Domestic Mains Socket Double 2 Gang Outlet Single Pole 13A White
Powerline adapters with electric socket adapters : r/HomeNetworking
TP-Link AV1000 Gigabit Passthrough Powerline ac Wi-Fi Kit, Dual Band Speed Up to 1200 Mbps, Wi-Fi Extender/ Booster, Extra Power Socket, No Configuration Required (TL-WPA7617 KIT) : Amazon.co.uk: Computers & Accessories
WiFi CONNEkT Add-On Socket | Comms Express
Power Ethernet Socket T1000 Review | Trusted Reviews