apparently you still need a cbt for a moped...
Moped licence requirements
A moped
MUST have an engine capacity not exceeding 50 cc, not weigh more than 250 kg and be designed to have a maximum speed not exceeding 31 mph (50 km/h). From June 2003 all EC Type Approved mopeds have been restricted to 28 mph (45 km/h).
Law RTA 1988 (as amended) sect 108
To ride a moped, learners
MUST- be 16 or over
- have a provisional moped licence
- complete CBT training.