Re: Oh well ....
...I've been trying to get PlusNet to sort out my speed and stability problems...
In the old ADSL days I kept getting connection problems. Support bod with Yorkshire accent said I should plug the router into the socket behind the faceplate of the master socket so they could monitor the equipment. Two days later they diagnosed a faulty router and sent me a replacement, which fixed the problem.
I now have FTTC and had an intermittent problem which was fixed by restarting the Openreach modem whenever the connection was lost. Without going into details there was a fault on the ring main supplying power to the modem. Fixed the problem and connection has been stable ever since.