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Looking to get wi-fi/internet to my shed at minimum cost and have a pair of BT vision powerline adapters that I found when we moved.
The house has had a full rewire so all cables are new, including the cable to the shed.
I'm not too good with this sort of stuff but was wondering if I can use the 2 adapters I have to get wi-fi to my shed approx 20m from the house.
The ones I have are these:

If so, how do I do it?
Any tips gratefully received.
So long as everything is run off the same consumer unit you should be fine. I live in an old house and there's a couple of corners that the wifi can't reach and the power-line adaptors work just fine.
Plug one of the adaptors into a socket close to your router. Run an ethernet cable from the router to the adaptor. In your shed, plug in the adaptor to a suitable socket. Finally run an ethernet cable from that adaptor to your computer or if you want wifi then you'll need another wifi hub and run the cable to that.
I do what whitstone suggests, but my 'extender' has wifi as well at the garage end. I've since disabled the wifi, as I upgraded to BT Mesh, but a computer and CCTV box still run off the ethernet powerline adapters. They work perfectly quick enough.