Hey Simon,
 
I just wanted to write and thank you so much for your help with advice and arranging the stuff we wanted for the retaining walls here. You have been excellent to deal with throughout the whole process and I really appreciate the time you have taken to talk to me throughout the process. If any friends are considering landscaping works I will definitely recommend you as a place to go to for materials, etc.
 
Let me know if you want some pics of what we have done when the work is completed - happy to send them through.
 
Cheers Mark