The Information Centre collects and publishes census data annually. The number of bank staff employed in the national health service is drawn from this data using the Non-Medical Workforce Census.
The Department does not record the number of agency staff the NHS employs, but does record how much it spends. This data is collected annually via the trusts financial returns. The National Audit Office report “Improving the use of temporary nursing staff in NHS acute and foundation trusts” published in June 2006 acknowledged that year-on-year the NHS is getting better value for money and improving quality.