Thank you for entrusting me to do some work in your business.
I would really appreciate your feedback so that I can improve, and your endorsement too if appropriate.
In addition to being hugely helpful to me personally, completing the following questions will also enable you to revisit the work we did, assess the benefit is has brought to the business and to highlight where you might need to focus next.
Simply answer the following few questions and click submit to send.
Many thanks in advance!