It's something us employee's have an issue with. To put it simply there should be a cap but it should be in tiers (just like it is sold) i.e 600K users should have Just over half the cap that 1mb users should have. If they tiered it properly then we could still please the top end users whilst not having the lower end users seeing any adverse loss of speed in their connection. This is apparently being looked into (so we are told) however I do find a lot of our customers on the 1mb service are using it for buisness purposes and trying to avoid business rates. Fair enough but they are the people who wind me up when they complain about the cap.
Simple answer is NTL still have the highest numbers of Broadband customers in the country which means that it can't be affecting the average user.