I have been asked to reply.
Members have a choice whether to ask the Department of Finance and Administration to settle constituency telephone accounts, including those for BT, or to pay them direct and reclaim the expenditure. In 2006-07 some 365 hon. Members had one or more accounts settled by the Department of Finance and Administration each of which would in future incur the new quarterly charge. On this basis the annual cost of the imposition of the charge of £4.50 is estimated to be approximately £20,000.