Do I win?

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The state of broadband in the UK is absolutely abysmal. The speed of a DSL connection is greatly dependent on your distance from the central exchange. My exchange is quite far away and this is usually the fastest I get, and it fluctuates between this and 400 kbps quite often. Since BT have announced that they are not planning on upgrading their copper infrastructure or replacing it with fibre optics, as long as I am on this copper line I won't get anything faster. Even with ADSL2+, the estimated top speed will only be around 10 mbps. (Which by then, everyone else will have 100 mbps FTTH.)
The problem is that it's difficult to complain, since the speeds quoted are always "up to". So if you do not get the speed, all customer service will say is "it's your copper cable", which is BT's issue and not theirs. However, BT do set a "minimum threshold" where if speeds fall below that, they will take action; for me it's set at 1000 kbps. Domino, in your case you should definitely take action.
Maybe it's time to switch to NTL cable. Most people that I know of are on the 10 mbps service, and they deliver the speed people pay for (usually). As long as if you don't mind horrible customer service, as with most large companies.
Edit: Here's my speed test.
Jam it back in, in the dark.