Yep, lots of different options depending on exactly how you want to set things up and how much you want to spend. Getting the ethernet in between the new wi-fi and your existing router is the important part.
Great. Good to know. I'm not naïve enough to think I can just plug something into the socket and expect it to appear as a network that I sign into with my existing WiFi password, but that would be the dream.
Getting work done (loft extension) and electrician is installing ethernet points in a couple of rooms (loft bedroom and another bedroom).
The other bedroom already has a PC that is currently just using WiFi, so I will just be wiring that connection.
In the loft, what, if anything, can I do to use that ethernet point to extend WiFi to that room?
EDIT: Is this what I want? https://www.amazon.co.uk/EAP115-UK-Wireless-Controller-Software/dp/B01IR41LJY/ref=psdc_430580031_t1_B08FRM31NG