If this only works on the PC you are using it isn't going to help those with teenager children sharing the network through a router. To monitor the bandwidth properly it has to be done on the SACM or STB.
NTL could do this and allow you access to the graphs online where you would log in and only have read access. I have downloaded bmextreme and have it running along du meter. Du meter is no good as it also adds the internel network traffic to the routers incoming and outgoing traffic.
It is really hard to know if you are inside or outside the guidlines of the AUP. Many don't care if they are or not I do care and wish to try and stay within the AUP.
I am willling to try and talk to NTL if more customers wish to have this feature added so they can monitor their usage. I don't need customer details just the forum names on here and a PM I can show saying that customers do want a way to monitor the usage.