All learner motorcyclists and moped riders must complete CBT before riding on the road unless they

• Passed a full moped test after 1 December 1990
• Live and ride on specified offshore islands
• Already hold a Certificate of Completion (DL196) obtained during a previous motorcycle entitlement or when riding a moped
• Intend to ride a moped and passed the car tests before 1st Feb 2001

When you've completed CBT you'll be given a DL196. You must produce this before you can take the practical motorcycle test.
A DL196 has a 2year life. If you don't pass both your theory and practical tests in that time then you'll have to take the CBT course again.
A DL196 obtained on a moped is valid for a motorcycle when the rider reaches the age of 17.