I have tried with both hard-wired ethernet cable and my PC which has a wireless adapter inbuilt. The problem is universal in all machines in our house. I know there isn't an issue with the laptop or PC.
We previously had good speeds throughout but even with Sky, it was exactly the same. It's been like it on and off for the past year and each time they send someone to fix the open reach sockets or cabinet etc. I am guessing the problem lies from that point somewhere.