Broadband getting worse

I, along with most people in North Norfolk, have to depend on BT to do the links between my home and the exchange and then my exchange down to the server that handles my Broadband.

Now, I pay for a business connection, which has a 20:1 contention rather than the standard 50:1, and up until 7 months ago I was getting (every day) a connection of just under 2Mb/s down and 796 Kb/s up.

Then it changed

Now I get 1152 Kb/s down and 256 Kb/s up, so I have lost half of my download speed and two thirds of my upload speed. ( I hear you say "Talk to the ISP")

I did, the ISP (Demon Internet -- Thus Telecom ) have been very helpful, but they say that the line is capped at 1Mb/s AT the Exchange, as there is a disconnect that happens regularly on the line, once or more times per day. Can I find anything that causes it? Can I hell!!

Now this week, performance is abysmal, everything is taking 2 - 3 times longer than it should, no extra load on the line from here, just is much slower. Who else in North Norfolk is suffering ?? Anyone