Asterix187, everything about your router statistics looks good except for the fact that you have only beem connected for two minutes and 52 seconds. Okay, the 40 dB of attenuation would imply that there is about 3km of line between you and the telephone exchange but for that attenuation the sync rate is good (slightly better than I achieve in very similar circumstnaces) and the downstream SNR is just as you would expect on a trouble-free line. Now, to be on the sage side, try not to disconnect your router for the next 5 days.
If you want to find out if you are currently "being restricted by BT" run the BT speed test at
http://speedtester.bt.com/ and see what the IP profile for your line is.