You can see if line fixed by Friday but I think you need to report a phone fault to 151 not a broadband fault. Get phone line fixed and broadband will improve
Did you buy the same TP Link adapters, as some have a known issue?
I assume you are talking about powerline adapters?
Did you fully unplug the new powerline adaptors so they had no power on them, so all you had was the home hub and phone plugged into the test socket via a microfilter?
Yep fully removed from the socket.
So if I've done that and have the phone and router plugged into the test switch via a filter then the problem must be external surely?
Or a faulty home hub.
The home hubs can be very fussy about line conditions, but if you see the lights on the home hub changing colour, then its most likely a line interruption, but you should be able to hear noise on the phone when that happens.
If not, then I would suspect its the home hub causing the problem.