When French President Hollande was photographed on the back of a scooter at his mistress' apartment it made headlines all over the world and led to the break-up of his seven-year relationship with the First Lady, Valerie Trierweiler. She has made her side of the story public in a book. 'Thanks for the Moment' - already a bestseller in France - is just what Francois Hollande doesn't need as he battles with a stagnant French economy and low approval ratings. Philippa Thomas has been talking to Madame Trierweiler and asked her first why she decided to go public.