We can all learn from Parisian flower shops. Make your shop inviting, always have fresh flowers on your doorstep. Oh, and smile and dazzle your customers with your bouquets. They have amazing photos of their biz, too.
Chez Michele flower shop in Borough Market, just off of the south end of London Bridge. If you're staying at Trinity Square Flat, this is a relatively short walk across London Bridge and a must see on Saturday mornings when you explore the market.