Through the Police Services Agreement and the annual budget setting process, Transport for London (TfL) agrees an establishment of officers, police community support officers and police staff with the British Transport Police (BTP) that is funded by TfL. TfL pays only for the officers employed to police the transport network in London, as agreed in the budget setting process, and does not pay for vacancies.

TfL has rigorous processes in place to scrutinise BTP's costs as well as to monitor levels of performance, service and delivery to ensure the best policing service is received on TfL routes.