To lend some evidence that Charlie Williams and Mark Hewlett may be the same person, that Telegraph article about the parachute accident was from 2004, the same year Mark Hewlett's bio says he became a pro photographer:
http://markhewlettphotography.com/about-me/Studied philosophy, fine art, and writing, periodically at UEA, NSAD, and ARU. Eventually he realised his passion for documentary photography with a special appreciation for the masters of the humanist tradition. He became a professional photographer in 2004. His commercial work includes photography for editorial, educational centres, manufacturers, national retailers, the events and music industries, charities, executive portraiture and a brief, but fun, foray into the world of weddings. His images have been included in both national and regional publications. His current focus is on fine art documentary and the creation of single images and collections. He is available for commissions and works with organisations or individuals on short and long-term projects. He’s an alright kind of a guy.