BT uses spyware to audit broadband use

BT has admitted to secretly using spyware to monitor the web surfing habits of tens of thousands of its British broadband customers. According to BT, this was merely a technical trial. Allegedly no personal data were collected since machines were identified "by anonymous code numbers" (presumably IP addresses - hardly anonymous) and content keywords were recorded, not website addresses (so what? It's still unethical and possibly illegal inteception in my book).