Originally Posted by Ian
When you say one of your neighbours, do you mean one either side or further away?
I should have been clearer that this only an assumption based on a conversation I had with a neighbour about how they could extend their Wifi, but I didn't go back and ask whether they had decided on this approach as it might look like I was complaining when I'm not.

That said, whatever is causing this is recent (but pre-Christmas lighting), is likely to be pretty close by and on the same phase. I haven't come across anything (even heavy duty three-phase water pumps) creating this kind of issue, so a PowerLine adaptor is my best guess. It's also the easiest solution for most people who need to extend their network through walls that reflect all wifi signals.

In our case, the Sky box couldn't see the Wifi extender six meters away (but the other side of the wall), so we ended up wiring pretty much every room in the house with ethernet sockets to get around this.

Prolific music listener / Hi-Fi addict!