Sorry thermal, this one slipped through my radar today.
As orly says, you are a long way from the exchange as you already know. The attenuation figures show that, but it's also a sad fact that the true attenuation is almost certainly much higher as those are the highest numbers many routers can display.
There is a possibility that you connection speed could be improved in two ways.
First you seem to have connected at night which always results in a lower connection speed than if you connect during daylight. Try reconnecting fairly close to mid-day at this time of year, but don't do more than two or three tries in an hour. The probable trigger point for the BT system to think your line is unstable is 10 in an hour, but given where you are starting from we don't want to go anywhere near that, in case something else on your line makes it more sensitive. The system could slow you down even more if this happens.
If you connect at 576kbps which is only a fraction more than now, then a few days later your BT IP Profile will rise to 500kbps, and you will get a bit more actual speed as a result. If you strike really lucky and get 864kbps or more (it goes in 32kbps steps) your profile would become 750kbps, more than double what you have now.
The second way is to make sure your connections and phone wiring are optimised. Do you have a split-face master socket where the bottom half will come off after undoing two screws? If so, is your router connected to it using just a short ADSL cable and a filter?
If not, please can you describe what you have connected to the phone where

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Internet connection - O2 Standard.