Jean-François Théodore, the discretely chic chief executive of Euronext, has pulled out all the stops in the exchange's roadshow for its IPO next month. Investors may spot that Théodore is wearing a smart Euronext corporate tie at the presentations. But this is a corporate tie with a difference - it has a subtle subliminal advertising message. The label is not the normal Dior or Hermes that one would expect from Théodore, but a little known haute couture house called, er, Euronext. We look forward to the new autumn collection.