A DL196 certificate validating a provisional moped or provisional motorcycle entitlement lasts for 2 years. CBT will have to be re-taken if both theory/practical tests are not passed within the 2-year certificate life. A DL196 certificate validating a full moped entitlement (via a car licence) is not subject to expiry.
You do not have to take CBT again if you hold a full motorcycle licence and wish to obtain a licence for another category of motorcycle.
Riders who have completed their CBT course on a moped with more than 2 wheels or who used a motorcycle/sidecar combination are restricted to riding those machines as a learner.
Once you have your Certificate (DL 196) you are advised to take additional training to pass your theory and practical DSA (module 1 & module 2) tests and qualify for a full motorcycle or moped licence. Again the Southern Sporting Training Scheme can help with this.