On Saturday 4th Feb about 8.30am I went to my local Costa in Sutton Coldfield UK. I paid for the coffee for the lady behind me. At first I think she thought I was a bit weird, so I explained the concept. She was certainly not going to take advantage as she said that she intended to have a medium latte but under the circumstances she would have a small. I insisted that she should have what she wanted and paid for a medium. Just prior to her leaving she came over "thank you, what a lovely way to start the day, I will pass it on and buy someone coffee myself"