The below lines would supersede the above:
Line 3: This is the most senior British Line that connects to the Romanov family. ( Maria Vladimirovna's son would also have a claim through his father through his descent from Queen Victoria's eldest daughter how his mother's descent from Prince Alfred is senior)
Henry VII - Margaret Tudor - James V of Scots - Mary Stuart Queen of Scots - James Stuart I and VI King of England, Scotland and Ireland - Elizabeth Stuart - Sophia Countess Palatine - George I of Great Britain and Hannover - George II of Great Britain and Hannover - Frederick Prince of Wales - George III - William Duke of Kent - Victoria of Great Britain - Alfred Duke of Edinburgh - Victoria Melita - Prince Vladimir Kyrillovitch of Russia - Maria Vladimirovna Romanov - George Romanov
Line 4: This is the second most senior Royal Line to the Romanov's (descent from the eldest daughter of George II of Great Britain)
Henry VII - Margaret Tudor - James V of Scots - Mary Stuart Queen of Scots - James Stuart I and VI King of England, Scotland and Ireland - Elizabeth Stuart - Sophia Countess Palatine - George I of Great Britain and Hannover - George II of Great Britain and Hannover - Anne, Princess Royal - Princess Carolina of Orange-Nassau -Frederick William, Prince of Nassau-Weilburg - Wilhelm, Duke of Nassau - Princess Therese of Nassau - Duchess Alexandra of Oldenburg ( Grand Duchess Alexandra Petrovna of Russia) - (HIH Grand Duke Nicholas Nikolaevich no issue) and HIH Grand Duke Peter Nikolaevich of Russia - HH Prince Roman Petrovitch of Russia - Prince Nicholas Romanovich Romanov.
Line 5: This is the next senior line descent from the second daughter of George II. Note HIH Grand Duchess Marie Pavlovna is a descendant in this line however her descendants have a senior claim through their Swedish Royal Line (descent from Caroline Matilda of Wales sister of George III of Great Britain)
Henry VII - Margaret Tudor - James V of Scots - Mary Stuart Queen of Scots - James Stuart I and VI King of England, Scotland and Ireland - Elizabeth Stuart - Sophia Countess Palatine - George I of Great Britain and Hannover - George II of Great Britain - Mary Princess of Great Britain - Frederick III Landgrave of Hesse Kassell - William X of Hesse Kassell - Louise of Hesse Kassell - Prince William of Denmark (george I of Greece) - Princess Alexandra of Greece and Denmark - HIH Grand Duke Dmitri Pavlovitch of Russia -
Line 6: This descent is same as above but follows as Marie is the younger daughter of George I of Greece.
Henry VII - Margaret Tudor - James V of Scots - Mary Stuart Queen of Scots - James Stuart I and VI King of England, Scotland and Ireland - Elizabeth Stuart - Sophia Countess Palatine - George I of Great Britain and Hannover - George II of Great Britain - Mary Princess of Great Britain - Frederick III Landgrave of Hesse Kassell - William X of Hesse Kassell - Louise of Hesse Kassell - Prince William of Denmark (george I of Greece) - Princess Marie of Greece and Denmark - HH Princess Nina Georgievna of Russia & HH Princess Xenia Georgievna of Russia
Line 7: Descent of Nicholas II from Henry VII through his mother Dagmar of Denmark - same line as the above two but junior as Dagmar would follow in succession after her brother William. (the only eligible descendants today of this line or firstly the descendants of HIH the Grand Duchess Xenia Alexandrovna then the descendants of HIH The Grand Duchess Olga Alexandrovna)
Henry VII - Margaret Tudor - James V of Scots - Mary Stuart Queen of Scots - James Stuart I and VI King of England, Scotland and Ireland - Elizabeth Stuart - Sophia Countess Palatine - George I of Great Britain and Hannover - George II of Great Britain - Mary Princess of Great Britain - Frederick III Landgrave of Hesse Kassell - William X of Hesse Kassell - Louise of Hesse Kassell - Dagmar Princess of Denmark (the Empress Marie Feodorovna of Russia) - Nicholas II of Russia
Line 8: This is the next in order descent from the youngest daughter of George II - however Sandro's descendants have a senior claim through their descent from Xenia Alexandrovna whilst the daughter of Sandro's brother Nadejda married a Mountbatten and her descendants also have a higher descent.
Henry VII - Margaret Tudor - James V of Scots - Mary Stuart Queen of Scots - James Stuart I and VI King of England, Scotland and Ireland - Elizabeth Stuart - Sophia Countess Palatine - George I of Great Britain and Hannover - George II of Great Britain - Princess Louise of Great Britain - Princess Sophia Magdalena of Denmark - King Gustav VI of Sweden - Princess Sophie of Sweden - Princess Cecile of Baden ( Grand Duchess Olga Feodorovna) - issue - Grand Duke Nicholas Mikhailovich of Russia, Grand Duchess Anastasia Mikhailovna of Russia, Grand Duke Michael Mikhailovich of Russia, Grand Duke George Mikhailovich of Russia, Grand Duke Alexander Mikhailovich (sandro), Grand Duke Sergei Mikhailovich of Russia, Grand Duke Alexei Mikhailovich of Russia.