Found the solution myself. I ran the PowerLine utility and it showed other PowerLine devices. With no Network Name it looks like I am picking up my next door neighbours PowerLine who also don't have...

Region : UnitedKingdom Model : TL-PA211 Hardware Version : Not Clear Firmware Version : ISP : TalkTalk Hi. I have a TalkTalk wireless router (DSL-3680). It works perfectly wirelessly. It works...