See: https://www.gov.uk/motorcycle-practical-test

You’ll need to have passed your theory test before taking your practical test.

The rules for the types of moped or motorcycle you can use for your test changed on 19 January 2013. See: https://www.gov.uk/motorcycle-practical-test/rules-for-mopeds-and-motorcycles-used-in-the-practical-riding-test.