On behalf of the team I am writing to thank you for your contribution to Bank of Mum & Dad. [The executive producer, the producer] and the rest of the crew were really happy with the work you did with [the subject] and the way in which you took on board what we were trying to achieve.

The team and I enjoyed working with you and hope that you found the experience rewarding and, in some way, enlightening.  Personally, I'd like to thank you for your patience, tenacity and good nature in unusual circumstances.  [The subject] really seemed to open up with you and seemed so much more relaxed after your session! Thanks for all the preparation you put in so that Monday could take place.  It definitely paid off!