Dear Ed, 

Many thanks for coming here yesterday to resolve the virus problem. I greatly appreciated the rapid reaction time & that you made an effort to accommodate this additional job, despite your other commitments. Your professional approach & skill on the task meant that I was very confident that you would resolve the problems. I will contact you in future if & when I have any queries but I hope it will not be anything like the virus threat you dealt with yesterday. 

I would rate the overall customer experience as 5 out of 5. 

Please use any or all of this comment for your website. 

Thanks again.