Joanne Gladders found codebreakers:

• Moderately reduces attainment gap“Spelling and reading ages increased by a few years”
• Significantly reduces teacher workload“All there and easy to use”
• Moderately improves teacher knowledge and skills“Knowledge of how specific learning difficulties can be addressed and their own knowledge of spelling rules”
• Significantly improves teaching efficiency and productivity“Activities are shirt and can be done in short sessions”
• Slightly saves school money“I would have thought it would in the long term and definitely value for money”