British Telecommunications Plc says it has been winning back customers from Mercury Communications Ltd in substantial numbers – but if it has, Mercury hasn’t noticed: the Cable & Wireless Plc subsidiary says that British Telecom has won back only about UKP6m of business while the Mercury order book rose to UKP300m in the past financial year; Mercury says it is adding customers at a rate of 19,000 a month, 12,000 of them residential.