Send a message to the person who requested a photo of the grave monument of William Marchant with the following comment:
William Marchant is my 4th Great Grandfather. I would never expect anyone to do what you are doing without sending an acknowledgement and a thankyou. I cannot believe that there are people out there that don't do this. I am very, very grateful for what you are doing. I've been to Chiddingstone but wouldn't have a clue where to start looking for my ancestors. So, thankyou, in advance.