.....and BT have a 15GB/month cap for their mid-range products (dropping to 150kbps if you exceed it) and an option to BUY additional Gigs at £1.95 if you exeed 15GB :O
They also include UPSTREAM data in your usage, so they are penalising you for requesting web pages now.
http://www.btyahoo.com/broadbandusage_holding