I received a yellow hand written envelope at the weekend with a very odd message inside. It simply says “3″ and “7PM” on a very weird type of paper. Further investigation led me to the back of the envelope where the envelope was de-bossed  showing me it was from Birmingham based Smile. I’ve tried to see if the paper has a hidden message on it by heating the paper up, wetting it, peeling it, rubbing it and seeing if it glows in the dark, all to no avail! Anyone else shed any light on this?