Inspired by the life of entrepreneur Harry Gordon Selfridge - portrayed in the series by U.S actor Jeremy Piven - the show has proven to be a huge audience hit, with around 6.8 million viewers tuning in across the UK.ITV have announced ten more episodes of the programme will be filmed this year.Studios executive producer Kate Lewis said: "We have some surprises in store for an audience in this third series. You only have to walk down Oxford Street today to know that Selfridges department store continued to be successful, but for its founder, Harry Selfridge, things were very different."His story was a rollercoaster ride that ended rather tragically. We pick up series three in 1919, the point at which his life really begins to unravel."Mr Selfridge has also been popular with international audiences, with the current second series due to air in the U.S at the end of March.