The annual cost of maintaining the Parliamentary switchboard service?
We have understood your question to relate to the Operator and Message Bureau service provided to Parliament. Please note that, although this service is provided to both Houses of Parliament, our response deals only with information for which the House of Commons is responsible. The House of Lords is a separate public authority for the purposes of the Freedom of Information Act 2000 and so, for information about the annual cost to the House of Lords, you may wish to also forward your request to the House of Lords.
This information is held by the House of Commons. The annual cost to the House of Commons of maintaining the Operator and Message Bureau service in the current financial year, 2018-19, is £315,250 (exclusive of VAT) which represents a saving of around 22% on the previous year.