Level 3 cycling, does not take that much time, the other levels are a foundation to it and should not be missed out. 1 or 2 sessions should be enough. If you complete level 3 you will be able to use all roads open to cyclist in the UK with confidence, and travel from town to town in a work day commute. Only motorways will not be open to you, level 3 covers.
How to use roundabouts, mini and multi-lane ones
How to use traffic lights, multi-lane ones
How to use dual carriage ways
How to and if to use cycle lanes
How to and if to use cycle paths
Recognising Hazards
Route planning