First clip: Paying tribute to her husband, Marina describes Alexander Litvinenko as a 'loving dad and friend'. She says that although he had made enemies, he was ultimately a caring person. He was a 'very special man'.

Second clip: Marina describes the traumatic impact on her son Anatoly of the family's departure from Russia six years ago, and then the subsequent poisoning of his father. She says that on being told of his father's death Anatoly told her that he had first lost his life six years ago.

Third clip: She explains that Alexander attempted to keep her in the dark about his business activities to protect her. She adds that it was important for him to know that she and their child would be safe.

Fourth clip: In the couple's last years living in Russia. Alexander was getting increasingly frustrated with his job, according to Marina. She says he became upset at what he was seeing within the FSB and what he was being asked to do.

Fifth clip: The day Alexander Litvinenko is thought to have been poisoned was also the anniversary of the couple's escape from Russia. Marina says she had cooked him a special chicken meal. That night, lying in bed, he told her that he was feeling sick.

Sixth clip: Marina describes how she struggled to cope with seeing her husband becoming sicker, and her despair at the deterioration in his condition. He went from being a handsome man to an old man within days as she attempted to hide her horror.

Seventh clip: The gravity of his condition dawned on Marina in the last couple of days of Alexander's life. In the video, she breaks down as she describes the moment when she suddenly realised her husband was about to die.

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