Patients with more advanced stages of cervix cancer are treated by radiotherapy. Overall, more than 50% are cured. Approximately half of those patients not cured have current cancer in the irradiated volume. Higher doses of radiation would be expected to cure more patients. To give high doses of radiation safely, the investigators need to know very precisely where the cancer is and then they can use new technology available at the Cross Cancer Institute (tomotherapy) to target the cancer precisely, giving higher doses to the cancerous tissues and lower doses to the non-cancerous tissues.