I had an interesting discussion this morning, among colleagues in other subject areas, about the rules for resubmitting Graded Units, either to convert a fail to a pass or to upgrade a result.
We found some useful guidance on this topic in a document entitled Guidance on the Implementation of Graded Units in HNC/Ds [PDF]. There is information on page 23 (about project-based GUs) and page 31 (about exam-based GUs). The key thing is that the re-assessment is based on a substantially different project or examination. It's up to centres whether re-assessment will be offered, and how much is charged, and suggests at least one opportunity for re-assessment is built into the programme.
Contact Caroline for more information about the Graded Units in Computing awards.