Mr Robertson

Dir Sir,
Just a few words of thanks for the work your employees did at the above property last week. They worked hard. They were polite and considerate. They were clean and tidy in difficult circumstances. In short, they were totally professional.
I have written in a similar manner to the council officer who authorised this work.
I will certainly recommend your company to anyone who wants a good job doing.
Best wishes for the future
Paul Robertson