The particular logistical problems of collecting cancer registration data in the South-Western region of England are discussed. The Regional Cancer Registry has endeavoured to overcome these through developing electronic links to hospital-based patient-information systems. Some of these involve data transfer on magnetic media, but there are also interrogation facilities which operate on a real-time, interactive basis, and complement these other facilities. A PC-based program (SNODEV5), which can accept data from histopathology computer systems, translate SNOMED codes to ICD-9, and produce files suitable for processing by the registry's Batch Data Entry system is described. Its contribution to the achievement and monitoring of equity in health care provision is discussed.