Appears there is a known fault with the PlusNet supplied Technicolor TG582n routers when using windows 10 PC's.
Basically DNS stops working resulting in all addresses being looked up as 198.18.1.x
PlusNet admit there is a fault, PlusNet know they cannot fix it..
Yet refuse to replace the routers, forcing people to sign new contracts to replace the router or make them pay £50 for a replacement.
Guessing people just cancel and go elsewhere ... seems a weird scenario they are putting people in.
Powered By PlusNet (again!) FTTC @ 78Mpbs