How many times can you take your cbt test after it has expired?

In the UK, if your Computer-Based Test (CBT) certificate has expired, you must retake the CBT before you can ride a motorcycle or scooter legally. There is no limit on the number of times you can retake the CBT, but you must complete the course and pass the assessment each time. It's advisable to retake the test as soon as possible to ensure your riding skills are up to date.