The main differences between them are the minimum length of time required to complete them, the degree of challenge and the minimum age at which you can start to do them.

Bronze, Silver and Gold levels have been created to encourage you to develop their abilities and progress towards achievement of a Gold Award at a pace roughly commensurate with your age.  The required time commitments and progress to be made at each level increases through Bronze, Silver to Gold.

The Bronze award can be started once you are 14 and takes a minimum of 6 months to complete.

The Silver award can be started once you are 15 and takes a minimum of 12 months to complete or 6 months if you already have your Bronze.

The Gold award can be started once you are 16 and takes a minimum of 18 months to complete or 12 months if you already have your Silver.