Maurice Saatchi defends brother Charles over the throat-grabbing incident with Nigella Maurice Saatchi was on The Andrew Marr Show to discuss his new book At the end of the interview, Marr asked him how his brother Charles was Lord Saatchi said relatives don't even know what goes on in a relationship Marr has been criticised for 'allowing Saatchi to apologise for his brother' Defence: Lord Saatchi defended his brother Charles today over allegations he grabbed his wife Nigella by the throat Lord Saatchi today leapt to his brother's defence over allegations he grabbed his wife Nigella by the throat at a restaurant. Maurice Saatchi was on The Andrew Marr Show to discuss his new book "Brutal Simplicity of Thought" when the host decided to quiz him on his brother's marriage. Marr asked Lord Saatchi how Charles was feeling following his very public split from celebrity chef Nigella. The chef is said to have filed for divorce after pictures emerged in June showing Charles Saatchi apparently grabbing his wife's throat during a heated exchange at Scott's restaurant in Mayfair. Marr asked his brother: 'I can't end without asking you about you about your brother, Charles has been through a very torrid time of it, and ask how he is and how you feel he has been treated by the media and public opinion?' Lord Saatchi then offered his view on the complexities of marriage, suggesting that 'persecution mania' can play a role. He told Marr: 'There are many aspects of human life, let's consider them: persecution mania, love, sex, marriage, work, there's are all areas which produce great difficulties for people. Family and marriage is certainly one of the most complex areas. Interview: Lord Saatchi was on The Andrew Marr Show to discuss his new book 'Brutal Simplicity of Thought' when the host asked him about his brother Charles He then added that 'marriage is a private place' before Marr pushed him, asking: 'So no one can understand what's going on?' Lord Saatchi agreed, saying no one ever knows what happens behind closed doors. He said: 'It's impossible for anybody, even best friends or relatives of people involved cannot know what really happens between a man and a woman. 'Until someone installs CCTV in people's bedrooms, then we will have the answer, but we don;t know until then.' The end of a marriage: The photo of Charles Saatchi with his hands round the throat of his wife Nigella Lawson led to their divorce Many viewers took to Twitter to criticise Marr for his line of questioning. Ruth McNeill ‏@InfoBears wrote: 'Andrew Marr crosses the line. Invasive cheek asking Maurice Saatchi about his brothers private relationship with wife! @kingbill73 tweeted: 'So #marr is allowing Saatchi to be an apologist for the vile actions of his brother. A new low. Vonny Watts ‏@vonnywatts wrote: 'Maurice Saatchi talking about how he thinks Charles was treated - "Persecution mania" - "marriage is a private place" - what rubbish.' Mystery: Lord Saatchi said no one, not even close friends or relatives, know what really goes on in a relationship when asked about his brother's split from celebrity chef Nigella