same for me when I did my CBT, I couldn't get the hang of using the clutch so I had to go back for a half day. only said £40 for the second session as it was only a mornings training, I assume they still need to cover their costs, insurance, bike hire and the hourly rate for the instructors time! don't let it get you down, go back and nail it, then you will feel much better and more importantly be safe when you get out on your own! imagine how bad an instructor would feel if he gave you a pass and days later you were injured or worse as a result of inadequate training!!