"Hello, I just wanted to say how impressed I was with your team who came to replace a window at our place in Herne Bay last week.
When your chap initially came to quote he clearly thought carefully about how best to do the job efficiently and safely. When he came back to do the job with a couple of others it was done efficiently, carefully and with no fuss. It was also considerably less expensive than the quote I received from another glass company (beginning with A). On both occasions your chap arrived when he said he would and rang when he was 20 minutes away, which was just excellent. It was amongst the best service we've had from tradespeople. So congratulations and thank you"