#SmileOn is a project solely designed to bring smiles to London.

15th-19th April 2013 #SmileOn will be leaving 12,500 bright yellow postcards featuring positive messages on the seats of the London Underground. The cards will also be lightly scented with clementine, psychologically the happiest scent. #SmileOn just wants to bring a smile to your Tube journey and hopefully you will share that smile with your fellow passengers, your friends and family and the wider world, via Twitter.

Pass on your card, or write a friend’s name and address on the back, pop on a stamp and drop it in the post. Let’s get as much of London smiling as we possibly can. It’s the greatest city in the world so let’s all look a bit happier about living, working or studying here.

We can recapture that lovely sense of friendliness we all experienced during the Olympics. 1 billion journeys are made each year on the Tube and how many of those are spent smiling? For one week we’ll get the Underground smiling. There is no financial motivation behind #SmileOn, only a desire to bring more smiles to London.

Follow #SmileOn on twitter here.