I am unable to gather any information about your local connection like power levels etc. for some reason. Can you please post these so we can check them or give us a call if you need help doing this.
I have managed to check the network segment to which your equipment is connected and there do not appear to have been any network problems recently. If you are still experiencing difficulties then please re-post with traceroutes to bbc.co.uk (no WWW) and any other sites which are causing you problems.