The powerline adapters I use are pretty good. TP link. I have 2 with a single rj45 and two with twin ports. The one behind the TV for instance, added when the TV WiFi broke, just gave me an acceptable 27mbps in both directions. I like that they have a pass through socket on the front so they are not stopping us from using the socket.

I did realise something while testing though. While I am getting the advertise 250mbps downloads I should be getting 68mbps uploads. Quite common and fixable by Vodafone 2nd line support. Thanks all for getting me to dig deeper :-)