I am writing to let you know how much my wife and I appreciated the way the work of repairing a drain was carried out.
We were most impressed with the thoroughly capable efficiency of your engineers, both during the initial investigation work a week ago and during the actual remedial work yesterday.
We were grateful for the knowledge the offending tree roots will not penetrate the pipe again. It is unfortunate that these things do happen without anyone having a suspicion of a problem, but you have put our minds at rest.
Thank you very much