A new British film company, Slingshot, opens for business this week with an ambitious pledge to produce 10 feature films over the next three years - a goal it hopes to achieve with a business model unique to [the UK]: producing and distributing digital feature films. Few deny that the future of the film industry is digital. However, the change-over from physical 35mm film and the production and distribution techniques associated with it has been slow. Meg Carter reports.