Dear [the tutor], I want to thank you again for all the support and encouragement you gave me during the course. It made a huge difference and I am certain that without your help I would not have been able to get to this point.
I realise that it must have been exasperating at times and I was far from a model student but am grateful for your perservance and also for the positive impact that the training has had on my own work with students.

Many thanks,

Michael.

My knowledge, strategies and confidence to work effectively as a tutor have increased and I have had more opportunities open up as a result of taking the course..

Try to evenly spread out observations over the academic year in order to get the most out of the feedback and experience.