Finland has a program called KIVA, which is an acronym for "against bullying" in Finnish. Basically, the program recognizes that teachers aren't always around, so the program encourages and teaches student bystanders to step up and say/do something. Here's a link that explains more. This strategy would certainly work with both case studies, but may be more applicable to Lucy's situation.
Some Schools employ a Bullying assessment to find out the frequency of bullying, where and when it happens. The assessments also help in determining how effective current anti-bullying methods are working and what needs to change. This Strategy would definitely have worked in Harry's Case study.
No single strategy is able to provide a complete solution to all forms of bullying. Effective anti bullying policies will therefore include a range of strategies that can be adapted to suit particular incidents and be built around a whole school approach, ideally involving parents, teachers and educational psychologists in creating a healthy positive environment for child development. Learn more about the South-African perspective in this article: Bullying, a whole school approach . Also check All Together Now, a "successful, three-year anti-bullying project with schools in Northern Ireland". This approach would definitely give both Harry and Lucy a fighting chance.