there was information posted about this on the forum!!! I received a email today actually, it goes like;
Over the time period 12/10/2006 to 20/10/2006 (8 days) you have downloaded 9.34 GB of data. Your monthly allowance is 30GB.
Based on your current level of usage, your projected bandwidth use (data download) for a 30 day time period will be: 35.03 GB.
If your current bandwidth usage continues then this would equate to an excess bandwidth charge of: £5 [£1/GB] for this month.
You can monitor your bandwidth use online daily in the Customer Account section on the website: https://www.idnet.net/login
I'd remember to look, but i can never remember my login and password for my adsl line.