His ITV series marks the centenary of the disaster and tells the famous tragedy across four episodes from the points of view of different passengers.  But as well as challenging the received wisdom about events on the ship, Mr Fellowes said the show was likely to attract the same scrutiny of its authenticity as Downton Abbey.  "Downton was a training ground for this," Mr Fellowes said in an interview with The Sunday Times Culture magazine.  "I mean, there was this one guy who was attacking the James Cameron movie, and the main base of his attack was that Cameron had the wrong lights lit in the hull. Well, I mean, hello?  "People make it their life, I suppose, and good luck to them. We've tried to be as accurate as we can, but I have absolutely no doubt there will be people who come out and say, 'Oh, the Gatti restaurant was this colour,' or something."  Mr Fellowes said he was braced for questions over his portrayal of the second mate Charles Lightoller, who was seen as a hero for allowing women and children to be evacuated first.  The Downton writer said Lightoller made mistakes, believing the men could swim to safety while the women and children were rescued.  But attention to the historical aspects of the series would be a sign of its success, he added.  He said: "People only care about that stuff when you have a hit. If Titanic manages to arouse passionate feelings about this, that or the other, then probably it means the show has landed."
Downton Abbey creator Julian Fellowes has said he is braced for even more   nitpicking over the historical details of his new mini-series about the   Titanic.