Information on the number of staff in the Home Department in 1997 has been published by the Cabinet Office (Tables 1A-1D) and is available on-line at:
It should be noted that HM Prison Service is listed separately in this table but was part of the Home Office in 1997.
The Quarterly Public Sector Employment Survey statistics for June 2009 are published by ONS and are available on-line. This survey confirms that there are currently 24,640 civil servants working for the Home Office and its Agencies.
Employment numbers over the period will have been affected by machinery of Government changes.