I'm surprised that no one has started a discussion on the stamps since they were released on Agatha Christie's birthday, the 15th September. I was at the Torquay Festival when they were released. It was suggested that 250 people attended the event. The queue in the marquee for the stamps was quite long and there were very few sets of stamps left at the end of the day. Mathew Prichard was signing the First Day Cover envelope and that added to the interest. Each stamp has a hidden feature, which varies from a heat patch to micro written words and details that can only be revealed with the use of an ultraviolet light. The stamps really are amazing.
One of the sessions was a talk from the stamp designer, Jim Sutherland, who explained the hidden elements of the stamps and his ideas behind their creation, certainly one of the highlights of the 2016 festival.