Thank you

One day last week a gentleman came in on his own, ordered a pot of tea (£2), handed over £5 and told Annie to put the change in the tips jar. She was stunned, tried to give him the change, but he insisted.
The next day he came in again and did the same thing.
While he was drinking his tea in the conservatory he ordered a sandwich (£5) and paid the correct money.
I chatted with him when I took out his lunch. He had a large camera bag. He was in the process of getting to grips with all the camera could do, he said. His grandson was a much better photographer than he, so he was trying to improve. He had been taking pictures of the fountain from all different angles over the past two days.
Later when I was serving someone at the counter he came into the main tearoom, dropped an envelope onto the tips jar and waved goodbye.
I am no photographer, but here it is:

Inside were five one pound coins.
Our mystery man has certainly left his mark.