AC @ Fraudband: MinusNet
You're lucky: I've been complaining since late October. Still, in December I had one day (Hogmanay) with a 2MBps+ speed. On every other date that I tested that month it has been lower than 2kBps. And yes, I've jumped through the hoops, connected to the test socket, tried another router (which they insist on calling a modem), and so on and so forth.
They're cute enough to write "We do not have any liability of any sort (including liability for negligence) for the acts or omissions of other service providers, or for faults in or failures of their networks and equipment" - although, of course MinusNet is owned by BT. As for trying to get them to have a BT engineer sent out - you might as well ask for them to organise a well-oiled stag night in Tehran.
It's getting so bad that I've even considered going back to the successors of Cabletel. What was wrong with a publicly-owned PSTN run for the benefit of the public, in the first place?
Thank goodness my work doesn't depend on the alleged broadband link - unlike my wife's. :-(
Tempted to put an "IT?" icon, since PlusNet doesn't seem to understand applying even the simplest of technology to benefit customers.