Thank you again for your hard work on the index, I am thrilled with it. I’ll certainly be back in touch when the next book needs one! 
I've just looked through the index and let me say a HUGE THANK YOU. I've been so impressed by your professionalism and intellectual clarity. You've done an excellent job.
I have now looked over the index carefully, and am very happy with it — it is really comprehensive, and fully meets my expectations, so thank you very much for doing this.