2 x D-Link DHP-P610AV Powerline Adapters 1000Mbps Gigabit TalkTalk, BT, Sky, EE
Then take the other DHP-P610AV to the room you require, plug it into a wall socket(not extension lead) and connect it to the LAN socket of the device (Smart TV, TV box, PC, console etc) using another Ethernet cable.